diff --git a/CLAUDE.md b/CLAUDE.md
index 2e5071e5..736c74c4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -122,7 +122,7 @@ example still carries a `tests/smoke/catalog.json` row and a falsifier.
 `examples/gallery.json` is the
 gallery's source of truth. When authoring a new gallery example, copy the anatomy of
 `examples/bmesh-gear/` (script structure, README shape, dark-studio render recipe) and
-wire all of: gallery.json entry, `.cursor-plugin/plugin.json` examples array (CI-gated),
+wire all of: gallery.json entry (with an `alt` sentence describing the still; the build fails without one), `.cursor-plugin/plugin.json` examples array (CI-gated),
 a `tests/smoke/catalog.json` row, a README gallery row, hero webp (1280×720) in
 `docs/gallery/assets/` + preview webp (1200×675), then run `python scripts/build_gallery.py`.
 A check-only example wires only the `.cursor-plugin/plugin.json` entry, the
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4ce2d6e0..5c79bdba 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -115,8 +115,9 @@ budget conformance, never an API contract.
    **named** budget fails.
 2. List the directory in `.cursor-plugin/plugin.json` `"showcase"` and add a
    `tests/smoke/catalog.json` row. The runner takes opaque script paths.
-3. Add a `showcase/gallery.json` `pieces[]` entry, render a still, and run
-   `python scripts/build_gallery.py`. Do not hand-edit `docs/gallery/` HTML.
+3. Add a `showcase/gallery.json` `pieces[]` entry, including an `alt`: one
+   sentence saying what the still shows (the generator fails without it).
+   Render a still, and run `python scripts/build_gallery.py`. Do not hand-edit `docs/gallery/` HTML.
 4. Update the README showcase-piece count. `validate-counts` checks it
    separately from the example total.
 
diff --git a/docs/gallery/anvil/index.html b/docs/gallery/anvil/index.html
index 585fd094..96d87649 100644
--- a/docs/gallery/anvil/index.html
+++ b/docs/gallery/anvil/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/anvil-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="anvil: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A black iron anvil mounted on a hooped timber stump." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="anvil — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural blacksmith anvil on a timber stump through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/anvil-hero.webp" />
-  <meta name="twitter:image:alt" content="anvil: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A black iron anvil mounted on a hooped timber stump." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>anvil</h1>
     <p>A procedural blacksmith anvil on a timber stump through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom anvil render">
-      <img src="../assets/anvil-hero.webp" alt="anvil render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A black iron anvil mounted on a hooped timber stump.">
+      <img src="../assets/anvil-hero.webp" alt="A black iron anvil mounted on a hooped timber stump." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2988 tris, two materials with 1040 wood and 822 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.621×0.414×0.489 m, LOD ratios in band, convex collider 134 tris, hygiene 0, 16 grounded staves, hoop bite 0.003 m, foot-on-head gap 0.003 m, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-staves 16; --float-anvil 17; --round-band 18.</div>
@@ -1677,7 +1677,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/anvil-hero.webp" alt="anvil render, full size" />
+    <img src="../assets/anvil-hero.webp" alt="A black iron anvil mounted on a hooped timber stump." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/armature-bend/index.html b/docs/gallery/armature-bend/index.html
index 5a900a48..c2cb137d 100644
--- a/docs/gallery/armature-bend/index.html
+++ b/docs/gallery/armature-bend/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/armature-bend-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="armature-bend: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="armature-bend — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Rigging end to end in the data API — edit_bones chain construction, name-bound vertex groups with smoothstep blend zones, posing, and depsgraph evaluation — bending a tapered tube through rest, half, and full curl." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/armature-bend-hero.webp" />
-  <meta name="twitter:image:alt" content="armature-bend: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>armature-bend</h1>
     <p>Rigging end to end in the data API — edit_bones chain construction, name-bound vertex groups with smoothstep blend zones, posing, and depsgraph evaluation — bending a tapered tube through rest, half, and full curl.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom armature-bend render">
-      <img src="../assets/armature-bend-hero.webp" alt="armature-bend render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature.">
+      <img src="../assets/armature-bend-hero.webp" alt="Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> edit_bones exists only in edit mode (empty in object mode), vertex groups bind to bones strictly by name, and the armature modifier is exactly linear blend skinning: every evaluated vertex must equal Σ wᵢ·(pose_bone.matrix @ bone.matrix_local.inverted()) @ rest, root ring pinned, tip deflected — a straight tube fails.</div>
@@ -636,7 +636,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/armature-bend-hero.webp" alt="armature-bend render, full size" />
+    <img src="../assets/armature-bend-hero.webp" alt="Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/attribute-domain-shear/index.html b/docs/gallery/attribute-domain-shear/index.html
index 311c7ecf..6aac9592 100644
--- a/docs/gallery/attribute-domain-shear/index.html
+++ b/docs/gallery/attribute-domain-shear/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/attribute-domain-shear-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="attribute-domain-shear: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="attribute-domain-shear — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="POINT vs CORNER color-attribute domains on a shared-vertex pinwheel: CORNER stays exact per face while a naive per-wedge POINT loop shears to the last write at the hub. Crisp petals versus a smeared swirl in one frame; the measured shear equals the palette closed form." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/attribute-domain-shear-hero.webp" />
-  <meta name="twitter:image:alt" content="attribute-domain-shear: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>attribute-domain-shear</h1>
     <p>POINT vs CORNER color-attribute domains on a shared-vertex pinwheel: CORNER stays exact per face while a naive per-wedge POINT loop shears to the last write at the hub. Crisp petals versus a smeared swirl in one frame; the measured shear equals the palette closed form.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom attribute-domain-shear render">
-      <img src="../assets/attribute-domain-shear-hero.webp" alt="attribute-domain-shear render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending.">
+      <img src="../assets/attribute-domain-shear-hero.webp" alt="Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Authoring per-face colors into a POINT-domain attribute overwrites shared vertices once per neighbor; the last write wins and intended colors shear across every shared vertex.</div>
@@ -722,7 +722,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/attribute-domain-shear-hero.webp" alt="attribute-domain-shear render, full size" />
+    <img src="../assets/attribute-domain-shear-hero.webp" alt="Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/bake-normal-high-to-low/index.html b/docs/gallery/bake-normal-high-to-low/index.html
index fac26300..a7882dfe 100644
--- a/docs/gallery/bake-normal-high-to-low/index.html
+++ b/docs/gallery/bake-normal-high-to-low/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/bake-normal-high-to-low-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="bake-normal-high-to-low: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="bake-normal-high-to-low — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A collapse-decimated hatch plate receiving a Cycles cage-baked tangent normal map from a ribbed high-poly source" />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/bake-normal-high-to-low-hero.webp" />
-  <meta name="twitter:image:alt" content="bake-normal-high-to-low: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>bake-normal-high-to-low</h1>
     <p>A collapse-decimated hatch plate receiving a Cycles cage-baked tangent normal map from a ribbed high-poly source</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom bake-normal-high-to-low render">
-      <img src="../assets/bake-normal-high-to-low-hero.webp" alt="bake-normal-high-to-low render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern.">
+      <img src="../assets/bake-normal-high-to-low-hero.webp" alt="A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Statistical gates not byte-identity: detail frac 0.7211 / MAD 0.09356 vs flat 0.0000 / 0.00277; --flat-source exits 5; type=NORMAL not bake_type; RNA identical on 4.5.11, 5.1.2, 5.2.1</div>
@@ -840,7 +840,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/bake-normal-high-to-low-hero.webp" alt="bake-normal-high-to-low render, full size" />
+    <img src="../assets/bake-normal-high-to-low-hero.webp" alt="A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/bmesh-gear/index.html b/docs/gallery/bmesh-gear/index.html
index f8bbebd3..b0cd8568 100644
--- a/docs/gallery/bmesh-gear/index.html
+++ b/docs/gallery/bmesh-gear/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/bmesh-gear-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="bmesh-gear: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="bmesh-gear — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A 14-tooth gear built entirely with bmesh — profile ring, face, extrude — with bm.free() in a try/finally, exactly as the ownership contract demands." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/bmesh-gear-hero.webp" />
-  <meta name="twitter:image:alt" content="bmesh-gear: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>bmesh-gear</h1>
     <p>A 14-tooth gear built entirely with bmesh — profile ring, face, extrude — with bm.free() in a try/finally, exactly as the ownership contract demands.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom bmesh-gear render">
-      <img src="../assets/bmesh-gear-hero.webp" alt="bmesh-gear render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves.">
+      <img src="../assets/bmesh-gear-hero.webp" alt="A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Parametric bmesh topology is exactly predictable: verts, edges, and faces match their closed forms, and every edge borders exactly two faces (watertight).</div>
@@ -531,7 +531,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/bmesh-gear-hero.webp" alt="bmesh-gear render, full size" />
+    <img src="../assets/bmesh-gear-hero.webp" alt="A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/campfire/index.html b/docs/gallery/campfire/index.html
index 69073293..9f00c5df 100644
--- a/docs/gallery/campfire/index.html
+++ b/docs/gallery/campfire/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/campfire-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="campfire: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A campfire of crossed logs in a teepee inside a ring of grey stone blocks." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="campfire — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural campfire through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/campfire-hero.webp" />
-  <meta name="twitter:image:alt" content="campfire: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A campfire of crossed logs in a teepee inside a ring of grey stone blocks." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>campfire</h1>
     <p>A procedural campfire through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom campfire render">
-      <img src="../assets/campfire-hero.webp" alt="campfire render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A campfire of crossed logs in a teepee inside a ring of grey stone blocks.">
+      <img src="../assets/campfire-hero.webp" alt="A campfire of crossed logs in a teepee inside a ring of grey stone blocks." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2200 tris, three materials with 216 wood, 48 ash and 1304 stone faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.807×0.808×0.404 m, LOD ratios in band, convex collider 198 tris, hygiene 0, 14 grounded bottom stones, teepee kiss 0.00001 m, course seat 0, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-stones 16; --float-logs 17; --gap-courses 18.</div>
@@ -1498,7 +1498,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/campfire-hero.webp" alt="campfire render, full size" />
+    <img src="../assets/campfire-hero.webp" alt="A campfire of crossed logs in a teepee inside a ring of grey stone blocks." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/car-mirror-symmetry/index.html b/docs/gallery/car-mirror-symmetry/index.html
index 58af13b6..e9155d65 100644
--- a/docs/gallery/car-mirror-symmetry/index.html
+++ b/docs/gallery/car-mirror-symmetry/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/car-mirror-symmetry-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="car-mirror-symmetry: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A red low-poly hatchback with white headlights, modelled as one mirrored half." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="car-mirror-symmetry — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A generic hatchback lofted as one half (14 stations, 9-point rings) and completed by the Mirror modifier, evaluated through the depsgraph. Wheels and lamps mirror about object origins parked on the symmetry plane." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/car-mirror-symmetry-hero.webp" />
-  <meta name="twitter:image:alt" content="car-mirror-symmetry: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A red low-poly hatchback with white headlights, modelled as one mirrored half." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>car-mirror-symmetry</h1>
     <p>A generic hatchback lofted as one half (14 stations, 9-point rings) and completed by the Mirror modifier, evaluated through the depsgraph. Wheels and lamps mirror about object origins parked on the symmetry plane.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom car-mirror-symmetry render">
-      <img src="../assets/car-mirror-symmetry-hero.webp" alt="car-mirror-symmetry render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A red low-poly hatchback with white headlights, modelled as one mirrored half.">
+      <img src="../assets/car-mirror-symmetry-hero.webp" alt="A red low-poly hatchback with white headlights, modelled as one mirrored half." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Mirror is a modifier, not applied data: the original keeps the authored half while the evaluated mesh is the welded, watertight, exactly symmetric whole.</div>
@@ -849,7 +849,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/car-mirror-symmetry-hero.webp" alt="car-mirror-symmetry render, full size" />
+    <img src="../assets/car-mirror-symmetry-hero.webp" alt="A red low-poly hatchback with white headlights, modelled as one mirrored half." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/cart/index.html b/docs/gallery/cart/index.html
index 3a073b5c..795a94d8 100644
--- a/docs/gallery/cart/index.html
+++ b/docs/gallery/cart/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/cart-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="cart: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="cart — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural two-wheel wooden cart through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/cart-hero.webp" />
-  <meta name="twitter:image:alt" content="cart: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>cart</h1>
     <p>A procedural two-wheel wooden cart through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom cart render">
-      <img src="../assets/cart-hero.webp" alt="cart render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor.">
+      <img src="../assets/cart-hero.webp" alt="A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2856 tris, two materials with metal and wood face floors, UVs in 0..1 with zero AABB overlap, outer AABB 1.539×0.749×0.640 m, LOD ratios in band, convex collider 154 tris, hygiene zero (loose, non-manifold, doubles, n-gons), zero coplanar cross-shell face pairs, both tyres grounded, tyre seat depth in band over 48 angular stations, the two wheels mirrored within 5e-5 m, grounded zmin, non-empty glTF. --flush-tyre exits 15 on the z-fight budget; --sink-tyre exits 18 on the tyre seat band; --float-wheel exits 16 on the named-support budget; --skew-wheel exits 19 on the wheel mirror; --skip-decimate exits 9 on the LOD1 ratio budget; --lift-z exits 16 on the grounded budget.</div>
@@ -1700,7 +1700,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/cart-hero.webp" alt="cart render, full size" />
+    <img src="../assets/cart-hero.webp" alt="A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/chopping-block/index.html b/docs/gallery/chopping-block/index.html
index 522a134a..b9f50e54 100644
--- a/docs/gallery/chopping-block/index.html
+++ b/docs/gallery/chopping-block/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/chopping-block-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="chopping-block: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A log-round chopping block bound with an iron hoop, an axe buried in its top." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="chopping-block — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural log-round chopping block with a riveted iron hoop and a felling axe buried in the sawn face, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/chopping-block-hero.webp" />
-  <meta name="twitter:image:alt" content="chopping-block: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A log-round chopping block bound with an iron hoop, an axe buried in its top." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>chopping-block</h1>
     <p>A procedural log-round chopping block with a riveted iron hoop and a felling axe buried in the sawn face, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom chopping-block render">
-      <img src="../assets/chopping-block-hero.webp" alt="chopping-block render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A log-round chopping block bound with an iron hoop, an axe buried in its top.">
+      <img src="../assets/chopping-block-hero.webp" alt="A log-round chopping block bound with an iron hoop, an axe buried in its top." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1800 tris, four materials with 180 bark / 216 grain / 404 metal / 176 haft faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.526 x 0.526 x 1.006 m, LOD ratios in band, convex collider 538 tris, non-empty glTF. Hygiene: zero non-manifold edges, loose geometry, doubles, zero-area faces, n-gons and coplanar disjoint face pairs, grounded at zmin 0, log plumb to 1e-7, oval haft 1.35 wide-to-thick. Joint fit: six shells, 18.0 mm haft clearance in the eye, 78.7 mm bit bury, hoop biting 3.7-4.2 mm into the log on every segment, two lap rivets seated 1.50 and 1.54 mm. --fat-haft exits 17 on eye clearance; --round-band and --float-rivets exit 18 on their seats; --round-haft exits 19 on the haft section.</div>
@@ -2288,7 +2288,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/chopping-block-hero.webp" alt="chopping-block render, full size" />
+    <img src="../assets/chopping-block-hero.webp" alt="A log-round chopping block bound with an iron hoop, an axe buried in its top." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/collision-hull-proxy/index.html b/docs/gallery/collision-hull-proxy/index.html
index de4c341c..3adddb5a 100644
--- a/docs/gallery/collision-hull-proxy/index.html
+++ b/docs/gallery/collision-hull-proxy/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/collision-hull-proxy-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="collision-hull-proxy: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="collision-hull-proxy — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A fire hydrant street prop inside its compound collision shell: four convex pieces hulled by bmesh.ops.convex_hull from a coarse inflated cage. The dense render mesh is never hulled - its hull would measure 380 faces, over the 255-face per-piece engine budget. Closed-form plane tests prove containment, convexity, watertightness, outward winding, and Euler characteristic 2 per piece." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/collision-hull-proxy-hero.webp" />
-  <meta name="twitter:image:alt" content="collision-hull-proxy: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>collision-hull-proxy</h1>
     <p>A fire hydrant street prop inside its compound collision shell: four convex pieces hulled by bmesh.ops.convex_hull from a coarse inflated cage. The dense render mesh is never hulled - its hull would measure 380 faces, over the 255-face per-piece engine budget. Closed-form plane tests prove containment, convexity, watertightness, outward winding, and Euler characteristic 2 per piece.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom collision-hull-proxy render">
-      <img src="../assets/collision-hull-proxy-hero.webp" alt="collision-hull-proxy render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull.">
+      <img src="../assets/collision-hull-proxy-hero.webp" alt="A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> A hull of the dense render mesh measures 380 faces, over the 255-face per-piece budget - the cage is a coarser lathe with rings inflated by sec(pi/n) so each cage ring circumscribes its render ring exactly (containment 4.4e-08). Proud details cost cage rows; concave grooves are free under the hull. Piece budgets: body 70, caps 60+60+60, compound 250.</div>
@@ -836,7 +836,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/collision-hull-proxy-hero.webp" alt="collision-hull-proxy render, full size" />
+    <img src="../assets/collision-hull-proxy-hero.webp" alt="A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/color-attribute-wheel/index.html b/docs/gallery/color-attribute-wheel/index.html
index a3543a56..e529d629 100644
--- a/docs/gallery/color-attribute-wheel/index.html
+++ b/docs/gallery/color-attribute-wheel/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/color-attribute-wheel-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="color-attribute-wheel: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A disc painted with a full hue wheel that fades to white at the centre." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="color-attribute-wheel — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The modern color-attributes API — mesh.color_attributes.new() on the CORNER domain, filled by expanding per-vertex HSV across face corners with foreach_get/foreach_set, then wired into a shader Attribute node." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/color-attribute-wheel-hero.webp" />
-  <meta name="twitter:image:alt" content="color-attribute-wheel: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A disc painted with a full hue wheel that fades to white at the centre." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>color-attribute-wheel</h1>
     <p>The modern color-attributes API — mesh.color_attributes.new() on the CORNER domain, filled by expanding per-vertex HSV across face corners with foreach_get/foreach_set, then wired into a shader Attribute node.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom color-attribute-wheel render">
-      <img src="../assets/color-attribute-wheel-hero.webp" alt="color-attribute-wheel render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A disc painted with a full hue wheel that fades to white at the centre.">
+      <img src="../assets/color-attribute-wheel-hero.webp" alt="A disc painted with a full hue wheel that fades to white at the centre." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> CORNER-domain attributes are sized to loop count, not vertex count; the check asserts the sizing, that active_color points at it, and that the Attribute node is actually linked to Base Color, not just present.</div>
@@ -618,7 +618,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/color-attribute-wheel-hero.webp" alt="color-attribute-wheel render, full size" />
+    <img src="../assets/color-attribute-wheel-hero.webp" alt="A disc painted with a full hue wheel that fades to white at the centre." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/compositor-glare/index.html b/docs/gallery/compositor-glare/index.html
index 4efcb8cf..b906ec99 100644
--- a/docs/gallery/compositor-glare/index.html
+++ b/docs/gallery/compositor-glare/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/compositor-glare-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="compositor-glare: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="compositor-glare — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Bloom where it actually lives — a compositor Glare (Fog Glow) node fed by Render Layers, wired via scene.compositing_node_group on 5.x and scene.node_tree on 4.x, with the Glare node&#x27;s legacy properties vs 5.x menu sockets." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/compositor-glare-hero.webp" />
-  <meta name="twitter:image:alt" content="compositor-glare: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>compositor-glare</h1>
     <p>Bloom where it actually lives — a compositor Glare (Fog Glow) node fed by Render Layers, wired via scene.compositing_node_group on 5.x and scene.node_tree on 4.x, with the Glare node&#x27;s legacy properties vs 5.x menu sockets.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom compositor-glare render">
-      <img src="../assets/compositor-glare-hero.webp" alt="compositor-glare render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor.">
+      <img src="../assets/compositor-glare-hero.webp" alt="Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> scene.node_tree is gone in 5.x and EEVEE has no use_bloom on either side: the halo beyond the ring silhouette falls off strictly with the compositor on and is exactly zero with it off.</div>
@@ -686,7 +686,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/compositor-glare-hero.webp" alt="compositor-glare render, full size" />
+    <img src="../assets/compositor-glare-hero.webp" alt="Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/crate-stack/index.html b/docs/gallery/crate-stack/index.html
index 3a8a7cee..7692035a 100644
--- a/docs/gallery/crate-stack/index.html
+++ b/docs/gallery/crate-stack/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/crate-stack-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="crate-stack: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three wooden shipping crates stacked, each turned slightly differently." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="crate-stack — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A stack of three procedural shipping crates built by one generator called three times with a per-instance seed, carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/crate-stack-hero.webp" />
-  <meta name="twitter:image:alt" content="crate-stack: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three wooden shipping crates stacked, each turned slightly differently." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>crate-stack</h1>
     <p>A stack of three procedural shipping crates built by one generator called three times with a per-instance seed, carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom crate-stack render">
-      <img src="../assets/crate-stack-hero.webp" alt="crate-stack render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three wooden shipping crates stacked, each turned slightly differently.">
+      <img src="../assets/crate-stack-hero.webp" alt="Three wooden shipping crates stacked, each turned slightly differently." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 4380 tris, two materials with 216 iron and 2436 timber faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.658×0.524×0.704 m, zmin 0, hygiene 0 including zero coplanar disjoint pairs, three ground runners at z=0, both crate-to-crate seats overlapping, each crate&#x27;s own footprint 0.585×0.425 m measured in its own frame, yaw spread 0.026 rad and plank spread 2.05 mm across instances, LOD ratios in band, convex collider 202 tris, non-empty glTF. --float-stack exits 18 on the seat; --same-seed exits 20 on per-instance variation.</div>
@@ -1737,7 +1737,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/crate-stack-hero.webp" alt="crate-stack render, full size" />
+    <img src="../assets/crate-stack-hero.webp" alt="Three wooden shipping crates stacked, each turned slightly differently." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/cross-version-property-delete/index.html b/docs/gallery/cross-version-property-delete/index.html
index 3146a344..b2bf00aa 100644
--- a/docs/gallery/cross-version-property-delete/index.html
+++ b/docs/gallery/cross-version-property-delete/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/cross-version-property-delete-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="cross-version-property-delete: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="cross-version-property-delete — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Custom ID properties are removed with del, not property_unset. The IDs are built through bpy.data.objects.new so the check does not depend on active_object." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/cross-version-property-delete-hero.webp" />
-  <meta name="twitter:image:alt" content="cross-version-property-delete: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>cross-version-property-delete</h1>
     <p>Custom ID properties are removed with del, not property_unset. The IDs are built through bpy.data.objects.new so the check does not depend on active_object.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom cross-version-property-delete render">
-      <img src="../assets/cross-version-property-delete-hero.webp" alt="cross-version-property-delete render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one.">
+      <img src="../assets/cross-version-property-delete-hero.webp" alt="Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Factory-empty has no active_object; property_unset raises TypeError and leaves the key; del removes it (clear_has=False). --skip-delete and --unset-instead exit 7.</div>
@@ -646,7 +646,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/cross-version-property-delete-hero.webp" alt="cross-version-property-delete render, full size" />
+    <img src="../assets/cross-version-property-delete-hero.webp" alt="Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/curve-bevel-arc/index.html b/docs/gallery/curve-bevel-arc/index.html
index 52e7d50f..f46ff658 100644
--- a/docs/gallery/curve-bevel-arc/index.html
+++ b/docs/gallery/curve-bevel-arc/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/curve-bevel-arc-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="curve-bevel-arc: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="curve-bevel-arc — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A beveled Bezier semicircle authored on bpy.types.Curve — splines.new(&#x27;BEZIER&#x27;), bezier_points, bevel_depth, use_fill_caps — so the curve renders as a solid tube without a prior mesh conversion." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/curve-bevel-arc-hero.webp" />
-  <meta name="twitter:image:alt" content="curve-bevel-arc: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>curve-bevel-arc</h1>
     <p>A beveled Bezier semicircle authored on bpy.types.Curve — splines.new(&#x27;BEZIER&#x27;), bezier_points, bevel_depth, use_fill_caps — so the curve renders as a solid tube without a prior mesh conversion.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom curve-bevel-arc render">
-      <img src="../assets/curve-bevel-arc-hero.webp" alt="curve-bevel-arc render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end.">
+      <img src="../assets/curve-bevel-arc-hero.webp" alt="A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Curve tubes are curve datablocks: eight Bezier points, bevel_depth == 0.15, filled caps, and the evaluated mesh has deterministic topology (1044 verts, 1028 faces) resting on the floor.</div>
@@ -569,7 +569,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/curve-bevel-arc-hero.webp" alt="curve-bevel-arc render, full size" />
+    <img src="../assets/curve-bevel-arc-hero.webp" alt="A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/custom-normals-shade/index.html b/docs/gallery/custom-normals-shade/index.html
index 56b1a637..0cf3e3d2 100644
--- a/docs/gallery/custom-normals-shade/index.html
+++ b/docs/gallery/custom-normals-shade/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/custom-normals-shade-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="custom-normals-shade: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="custom-normals-shade — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A jerry can prop shaded three ways to prove the post-4.1 shading contract: hard edges are mesh data, landing exactly where the dihedral crosses. Face smooth flags plus a sharp_edge attribute, verified against an independently recomputed dihedral test, and per-loop custom normals surviving depsgraph evaluation within their int16 storage quantization (1.407e-04, not float-exact)." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/custom-normals-shade-hero.webp" />
-  <meta name="twitter:image:alt" content="custom-normals-shade: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>custom-normals-shade</h1>
     <p>A jerry can prop shaded three ways to prove the post-4.1 shading contract: hard edges are mesh data, landing exactly where the dihedral crosses. Face smooth flags plus a sharp_edge attribute, verified against an independently recomputed dihedral test, and per-loop custom normals surviving depsgraph evaluation within their int16 storage quantization (1.407e-04, not float-exact).</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom custom-normals-shade render">
-      <img src="../assets/custom-normals-shade-hero.webp" alt="custom-normals-shade render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle.">
+      <img src="../assets/custom-normals-shade-hero.webp" alt="Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> use_auto_smooth, use_custom_normals and calc_normals are AttributeError on BOTH 4.5 LTS and 5.1 - AI code still emits them. The legacy shade_auto_smooth operator CANCELS headless on 4.5 (asset load never finishes; mesh untouched; no exception) while 5.1 FINISHES with the Smooth by Angle NODES modifier. By-angle sharp sets match the independent dihedral recompute exactly (188 of 388 edges over 3 meshes).</div>
@@ -910,7 +910,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/custom-normals-shade-hero.webp" alt="custom-normals-shade render, full size" />
+    <img src="../assets/custom-normals-shade-hero.webp" alt="Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/damped-track-aim/index.html b/docs/gallery/damped-track-aim/index.html
index 76227c36..9d95b19d 100644
--- a/docs/gallery/damped-track-aim/index.html
+++ b/docs/gallery/damped-track-aim/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/damped-track-aim-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="damped-track-aim: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Gold spikes arranged around a glowing sphere, every tip aimed at the sphere." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="damped-track-aim — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Aim constraints via the data API — Object.constraints.new(&#x27;DAMPED_TRACK&#x27;) with target and TRACK_Z, not bpy.ops.object.constraint_add in a headless loop. Gallery still: brass spike cage around an ember core." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/damped-track-aim-hero.webp" />
-  <meta name="twitter:image:alt" content="damped-track-aim: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Gold spikes arranged around a glowing sphere, every tip aimed at the sphere." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>damped-track-aim</h1>
     <p>Aim constraints via the data API — Object.constraints.new(&#x27;DAMPED_TRACK&#x27;) with target and TRACK_Z, not bpy.ops.object.constraint_add in a headless loop. Gallery still: brass spike cage around an ember core.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom damped-track-aim render">
-      <img src="../assets/damped-track-aim-hero.webp" alt="damped-track-aim render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Gold spikes arranged around a glowing sphere, every tip aimed at the sphere.">
+      <img src="../assets/damped-track-aim-hero.webp" alt="Gold spikes arranged around a glowing sphere, every tip aimed at the sphere." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Every needle has one unmuted DAMPED_TRACK on the core; evaluated local +Z aligns toward the core (dot ≥ 0.998). TRACK_TO stand-ins and flipped axes fail.</div>
@@ -719,7 +719,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/damped-track-aim-hero.webp" alt="damped-track-aim render, full size" />
+    <img src="../assets/damped-track-aim-hero.webp" alt="Gold spikes arranged around a glowing sphere, every tip aimed at the sphere." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/degenerate-bevel-weld/index.html b/docs/gallery/degenerate-bevel-weld/index.html
index 2a2ff564..507926ad 100644
--- a/docs/gallery/degenerate-bevel-weld/index.html
+++ b/docs/gallery/degenerate-bevel-weld/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/degenerate-bevel-weld-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="degenerate-bevel-weld: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="degenerate-bevel-weld — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Bevel offset &gt;= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles crossing the export boundary. Dual tray: rounded edge versus knife seam, markers from live mesh data." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/degenerate-bevel-weld-hero.webp" />
-  <meta name="twitter:image:alt" content="degenerate-bevel-weld: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>degenerate-bevel-weld</h1>
     <p>Bevel offset &gt;= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles crossing the export boundary. Dual tray: rounded edge versus knife seam, markers from live mesh data.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom degenerate-bevel-weld render">
-      <img src="../assets/degenerate-bevel-weld-hero.webp" alt="degenerate-bevel-weld render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners.">
+      <img src="../assets/degenerate-bevel-weld-hero.webp" alt="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> At offset == min_dimension/2 the bevel band pinches to exactly 12 zero-area faces (4 edges x 3 segments); 32 degenerate triangles cross into the exported GLB, waiting for any merge-by-distance to weld them.</div>
@@ -728,7 +728,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/degenerate-bevel-weld-hero.webp" alt="degenerate-bevel-weld render, full size" />
+    <img src="../assets/degenerate-bevel-weld-hero.webp" alt="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/depsgraph-export/index.html b/docs/gallery/depsgraph-export/index.html
index 594250f4..59b245fc 100644
--- a/docs/gallery/depsgraph-export/index.html
+++ b/docs/gallery/depsgraph-export/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/depsgraph-export-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="depsgraph-export: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A teal cube beside a slightly faceted teal sphere on a dark studio floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="depsgraph-export — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The depsgraph lifetime contract — evaluated_get().to_mesh() paired with to_mesh_clear() — measured against an OBJ export of the same object." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/depsgraph-export-hero.webp" />
-  <meta name="twitter:image:alt" content="depsgraph-export: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A teal cube beside a slightly faceted teal sphere on a dark studio floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>depsgraph-export</h1>
     <p>The depsgraph lifetime contract — evaluated_get().to_mesh() paired with to_mesh_clear() — measured against an OBJ export of the same object.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom depsgraph-export render">
-      <img src="../assets/depsgraph-export-hero.webp" alt="depsgraph-export render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A teal cube beside a slightly faceted teal sphere on a dark studio floor.">
+      <img src="../assets/depsgraph-export-hero.webp" alt="A teal cube beside a slightly faceted teal sphere on a dark studio floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Exports ship evaluated geometry: the exported vertex count equals the subsurf-applied count and is strictly greater than the base mesh.</div>
@@ -554,7 +554,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/depsgraph-export-hero.webp" alt="depsgraph-export render, full size" />
+    <img src="../assets/depsgraph-export-hero.webp" alt="A teal cube beside a slightly faceted teal sphere on a dark studio floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/driver-wave/index.html b/docs/gallery/driver-wave/index.html
index b8d76929..24962258 100644
--- a/docs/gallery/driver-wave/index.html
+++ b/docs/gallery/driver-wave/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/driver-wave-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="driver-wave: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="driver-wave — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A driver_namespace function driving sixteen column heights through SCRIPTED drivers — the sine skyline is entirely driver-evaluated." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/driver-wave-hero.webp" />
-  <meta name="twitter:image:alt" content="driver-wave: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>driver-wave</h1>
     <p>A driver_namespace function driving sixteen column heights through SCRIPTED drivers — the sine skyline is entirely driver-evaluated.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom driver-wave render">
-      <img src="../assets/driver-wave-hero.webp" alt="driver-wave render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends.">
+      <img src="../assets/driver-wave-hero.webp" alt="A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Driven values appear after a view-layer update in two places that must agree: the evaluated copy and the original datablock the animation system flushes for display.</div>
@@ -528,7 +528,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/driver-wave-hero.webp" alt="driver-wave render, full size" />
+    <img src="../assets/driver-wave-hero.webp" alt="A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/export-preset-axis/index.html b/docs/gallery/export-preset-axis/index.html
index 9136e179..f9730023 100644
--- a/docs/gallery/export-preset-axis/index.html
+++ b/docs/gallery/export-preset-axis/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/export-preset-axis-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="export-preset-axis: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="export-preset-axis — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A radio beacon exported under Unity and Godot glTF presets and re-imported, proving the two files have different vertex orientation" />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/export-preset-axis-hero.webp" />
-  <meta name="twitter:image:alt" content="export-preset-axis: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>export-preset-axis</h1>
     <p>A radio beacon exported under Unity and Godot glTF presets and re-imported, proving the two files have different vertex orientation</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom export-preset-axis render">
-      <img src="../assets/export-preset-axis-hero.webp" alt="export-preset-axis render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side.">
+      <img src="../assets/export-preset-axis-hero.webp" alt="Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Unity export_yup=True round-trips standing (x,y,z); Godot export_yup=False reimports lying along -Y as (x,-z,y); --same-axis exits 9; exporter RNA is guarded so a future kwarg rename fails loudly</div>
@@ -823,7 +823,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/export-preset-axis-hero.webp" alt="export-preset-axis render, full size" />
+    <img src="../assets/export-preset-axis-hero.webp" alt="Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/fence-kit/index.html b/docs/gallery/fence-kit/index.html
index cceb1498..2db63540 100644
--- a/docs/gallery/fence-kit/index.html
+++ b/docs/gallery/fence-kit/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/fence-kit-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="fence-kit: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A section of wooden post-and-rail fence with a diagonal brace and dark iron collars." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="fence-kit — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural post-and-rail fence section whose brace is an oriented box between named post stations, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/fence-kit-hero.webp" />
-  <meta name="twitter:image:alt" content="fence-kit: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A section of wooden post-and-rail fence with a diagonal brace and dark iron collars." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>fence-kit</h1>
     <p>A procedural post-and-rail fence section whose brace is an oriented box between named post stations, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom fence-kit render">
-      <img src="../assets/fence-kit-hero.webp" alt="fence-kit render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A section of wooden post-and-rail fence with a diagonal brace and dark iron collars.">
+      <img src="../assets/fence-kit-hero.webp" alt="A section of wooden post-and-rail fence with a diagonal brace and dark iron collars." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1092 tris, two materials with 156 metal and 390 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.624×0.134×1.232 m, grounded zmin, 2 iron shoes, brace-to-post gap 2.4 mm on both posts, rail-to-post gap 0.93 mm, rail span 1.390 m, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 32 tris, hygiene all zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-shoes 16; --short-brace 17; --gap-rails 18; --long-rails 19.</div>
@@ -1404,7 +1404,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/fence-kit-hero.webp" alt="fence-kit render, full size" />
+    <img src="../assets/fence-kit-hero.webp" alt="A section of wooden post-and-rail fence with a diagonal brace and dark iron collars." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gltf-export-roundtrip/index.html b/docs/gallery/gltf-export-roundtrip/index.html
index ba9d9721..cd496e79 100644
--- a/docs/gallery/gltf-export-roundtrip/index.html
+++ b/docs/gallery/gltf-export-roundtrip/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gltf-export-roundtrip-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gltf-export-roundtrip: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gltf-export-roundtrip — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A sci-fi supply crate exported to glTF and re-imported, verifying the round-trip against the depsgraph-evaluated mesh within float tolerances. Positions, loop normals, box-mapped UVs, and per-triangle material bindings must all survive; the on-disk JSON proves the +Y-up conversion and the V-flipped UV layout." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gltf-export-roundtrip-hero.webp" />
-  <meta name="twitter:image:alt" content="gltf-export-roundtrip: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gltf-export-roundtrip</h1>
     <p>A sci-fi supply crate exported to glTF and re-imported, verifying the round-trip against the depsgraph-evaluated mesh within float tolerances. Positions, loop normals, box-mapped UVs, and per-triangle material bindings must all survive; the on-disk JSON proves the +Y-up conversion and the V-flipped UV layout.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gltf-export-roundtrip render">
-      <img src="../assets/gltf-export-roundtrip-hero.webp" alt="gltf-export-roundtrip render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP.">
+      <img src="../assets/gltf-export-roundtrip-hero.webp" alt="Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> export_yup bakes (x, y, z) -&gt; (x, z, -y) into the vertex data with no node rotation (probed identical on 4.5.11 and 5.1.2); export_apply ships the evaluated mesh, not the base cage; exporter/importer RNA is guarded so a future kwarg rename fails loudly.</div>
@@ -946,7 +946,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gltf-export-roundtrip-hero.webp" alt="gltf-export-roundtrip render, full size" />
+    <img src="../assets/gltf-export-roundtrip-hero.webp" alt="Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gltf-skin-roundtrip/index.html b/docs/gallery/gltf-skin-roundtrip/index.html
index 503ed00c..6d5bfdd5 100644
--- a/docs/gallery/gltf-skin-roundtrip/index.html
+++ b/docs/gallery/gltf-skin-roundtrip/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gltf-skin-roundtrip-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gltf-skin-roundtrip: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gltf-skin-roundtrip — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A rigged mech scorpion exported to glTF with skins and re-imported, verifying the skinning contract the geometry round-trip left uncovered. Skeleton, weights, and deformation must all survive the format." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gltf-skin-roundtrip-hero.webp" />
-  <meta name="twitter:image:alt" content="gltf-skin-roundtrip: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gltf-skin-roundtrip</h1>
     <p>A rigged mech scorpion exported to glTF with skins and re-imported, verifying the skinning contract the geometry round-trip left uncovered. Skeleton, weights, and deformation must all survive the format.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gltf-skin-roundtrip render">
-      <img src="../assets/gltf-skin-roundtrip-hero.webp" alt="gltf-skin-roundtrip render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported.">
+      <img src="../assets/gltf-skin-roundtrip-hero.webp" alt="Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> skins[0].joints names every bone; JOINTS_0/WEIGHTS_0 per primitive with unit sums; weights bit-exact on re-import; deformation matches within 4.8e-07. The mesh must be parented to the armature or the exporter binds by name.</div>
@@ -919,7 +919,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gltf-skin-roundtrip-hero.webp" alt="gltf-skin-roundtrip render, full size" />
+    <img src="../assets/gltf-skin-roundtrip-hero.webp" alt="Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gn-instance-grid/index.html b/docs/gallery/gn-instance-grid/index.html
index e8f5d837..aabf314f 100644
--- a/docs/gallery/gn-instance-grid/index.html
+++ b/docs/gallery/gn-instance-grid/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-instance-grid-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gn-instance-grid: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A three-by-three grid of green instanced cubes on a dark floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gn-instance-grid — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A generative Geometry Nodes tree — Mesh Grid → Instance on Points → Realize Instances → Set Shade Smooth — attached as a NODES modifier with no Group Input geometry." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-instance-grid-hero.webp" />
-  <meta name="twitter:image:alt" content="gn-instance-grid: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A three-by-three grid of green instanced cubes on a dark floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gn-instance-grid</h1>
     <p>A generative Geometry Nodes tree — Mesh Grid → Instance on Points → Realize Instances → Set Shade Smooth — attached as a NODES modifier with no Group Input geometry.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gn-instance-grid render">
-      <img src="../assets/gn-instance-grid-hero.webp" alt="gn-instance-grid render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A three-by-three grid of green instanced cubes on a dark floor.">
+      <img src="../assets/gn-instance-grid-hero.webp" alt="A three-by-three grid of green instanced cubes on a dark floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Realized instances produce closed-form topology (72 verts, 54 faces), Set Material carries Lime, and the corner instance center sits at its closed-form grid coordinate.</div>
@@ -584,7 +584,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gn-instance-grid-hero.webp" alt="gn-instance-grid render, full size" />
+    <img src="../assets/gn-instance-grid-hero.webp" alt="A three-by-three grid of green instanced cubes on a dark floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gn-modifier-inputs/index.html b/docs/gallery/gn-modifier-inputs/index.html
index ca0a7a70..6eb5ef2f 100644
--- a/docs/gallery/gn-modifier-inputs/index.html
+++ b/docs/gallery/gn-modifier-inputs/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-modifier-inputs-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gn-modifier-inputs: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three boxes stepping up in size from a small teal cube to an orange block to a large red block." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gn-modifier-inputs — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Per-modifier Geometry Nodes Float inputs on a shared tree — 4.5/5.1 write mod[identifier], 5.2 writes mod.properties.inputs.Socket_1.value." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-modifier-inputs-hero.webp" />
-  <meta name="twitter:image:alt" content="gn-modifier-inputs: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three boxes stepping up in size from a small teal cube to an orange block to a large red block." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gn-modifier-inputs</h1>
     <p>Per-modifier Geometry Nodes Float inputs on a shared tree — 4.5/5.1 write mod[identifier], 5.2 writes mod.properties.inputs.Socket_1.value.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gn-modifier-inputs render">
-      <img src="../assets/gn-modifier-inputs-hero.webp" alt="gn-modifier-inputs render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three boxes stepping up in size from a small teal cube to an orange block to a large red block.">
+      <img src="../assets/gn-modifier-inputs-hero.webp" alt="Three boxes stepping up in size from a small teal cube to an orange block to a large red block." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> The 5.1 dict form raises TypeError on 5.2 rather than silently no-opping; RNA properties are AttributeError on 4.5. Readback and evaluated Z-extent match written scales 1/2/3.</div>
@@ -718,7 +718,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gn-modifier-inputs-hero.webp" alt="gn-modifier-inputs render, full size" />
+    <img src="../assets/gn-modifier-inputs-hero.webp" alt="Three boxes stepping up in size from a small teal cube to an orange block to a large red block." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gn-sdf-remesh/index.html b/docs/gallery/gn-sdf-remesh/index.html
index b8ff4fc8..81a4ae5c 100644
--- a/docs/gallery/gn-sdf-remesh/index.html
+++ b/docs/gallery/gn-sdf-remesh/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-sdf-remesh-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gn-sdf-remesh: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A glossy red torus with visibly blocky voxel faceting from the SDF remesh." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gn-sdf-remesh — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A Geometry Nodes SDF remesh (MeshToSDFGrid → GridToMesh at the SDF zero-level), with a Set Material node carrying the material through the remesh." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-sdf-remesh-hero.webp" />
-  <meta name="twitter:image:alt" content="gn-sdf-remesh: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A glossy red torus with visibly blocky voxel faceting from the SDF remesh." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gn-sdf-remesh</h1>
     <p>A Geometry Nodes SDF remesh (MeshToSDFGrid → GridToMesh at the SDF zero-level), with a Set Material node carrying the material through the remesh.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gn-sdf-remesh render">
-      <img src="../assets/gn-sdf-remesh-hero.webp" alt="gn-sdf-remesh render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A glossy red torus with visibly blocky voxel faceting from the SDF remesh.">
+      <img src="../assets/gn-sdf-remesh-hero.webp" alt="A glossy red torus with visibly blocky voxel faceting from the SDF remesh." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> An SDF grid is meshed with Grid to Mesh, not Volume to Mesh; GN geometry needs Set Material or it renders untextured.</div>
@@ -463,7 +463,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gn-sdf-remesh-hero.webp" alt="gn-sdf-remesh render, full size" />
+    <img src="../assets/gn-sdf-remesh-hero.webp" alt="A glossy red torus with visibly blocky voxel faceting from the SDF remesh." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gn-socket-rename/index.html b/docs/gallery/gn-socket-rename/index.html
index f886d238..83cb928c 100644
--- a/docs/gallery/gn-socket-rename/index.html
+++ b/docs/gallery/gn-socket-rename/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-socket-rename-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gn-socket-rename: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A copper measuring column with graduated tick marks standing on a grey base plate." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gn-socket-rename — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Compare and Random Value socket identifiers collapsed onto reused names in 5.2; enabled-name lookup wires on 4.5, 5.1, and 5.2" />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-socket-rename-hero.webp" />
-  <meta name="twitter:image:alt" content="gn-socket-rename: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A copper measuring column with graduated tick marks standing on a grey base plate." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gn-socket-rename</h1>
     <p>Compare and Random Value socket identifiers collapsed onto reused names in 5.2; enabled-name lookup wires on 4.5, 5.1, and 5.2</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gn-socket-rename render">
-      <img src="../assets/gn-socket-rename-hero.webp" alt="gn-socket-rename render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A copper measuring column with graduated tick marks standing on a grey base plate.">
+      <img src="../assets/gn-socket-rename-hero.webp" alt="A copper measuring column with graduated tick marks standing on a grey base plate." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> A_INT and Min_001 present on 4.5.11 and 5.1.2, absent on 5.2.1. --legacy-ids exits 5 only on 5.2. Evaluated 16 verts and gauge_h 1.80 on eight column verts; the still draws the column graduations from gauge_h, so an unwired Random Value renders a blank column</div>
@@ -874,7 +874,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gn-socket-rename-hero.webp" alt="gn-socket-rename render, full size" />
+    <img src="../assets/gn-socket-rename-hero.webp" alt="A copper measuring column with graduated tick marks standing on a grey base plate." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gn-zone-iterate/index.html b/docs/gallery/gn-zone-iterate/index.html
index 53b51224..6c268126 100644
--- a/docs/gallery/gn-zone-iterate/index.html
+++ b/docs/gallery/gn-zone-iterate/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-zone-iterate-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gn-zone-iterate: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gn-zone-iterate — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Repeat Zone and For Each Element only iterate after pair_with_output. Evaluated cube counts follow 8 times (1+N) and 8 times P, not tree structure." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gn-zone-iterate-hero.webp" />
-  <meta name="twitter:image:alt" content="gn-zone-iterate: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gn-zone-iterate</h1>
     <p>Repeat Zone and For Each Element only iterate after pair_with_output. Evaluated cube counts follow 8 times (1+N) and 8 times P, not tree structure.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gn-zone-iterate render">
-      <img src="../assets/gn-zone-iterate-hero.webp" alt="gn-zone-iterate render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone.">
+      <img src="../assets/gn-zone-iterate-hero.webp" alt="Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Repeat 32/24 verts/faces with X-centers at k*1.2; For Each 48/36 with Z-centers at i*0.6+0.21. Unpaired evaluates empty; For Each main Geometry passthrough is 6 verts.</div>
@@ -731,7 +731,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gn-zone-iterate-hero.webp" alt="gn-zone-iterate render, full size" />
+    <img src="../assets/gn-zone-iterate-hero.webp" alt="Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/gp-lineart-contour/index.html b/docs/gallery/gp-lineart-contour/index.html
index a68ad5d3..7265ceb4 100644
--- a/docs/gallery/gp-lineart-contour/index.html
+++ b/docs/gallery/gp-lineart-contour/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gp-lineart-contour-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="gp-lineart-contour: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="gp-lineart-contour — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Grease Pencil LINEART modifier contours via the depsgraph on a faceted crystal. source_object is load-bearing (clear yields 0 strokes); contour+crease off yields 0; restore recovers 10 strokes / 34 points on both 4.5.11 and 5.1.2. Stroke width: thickness exists on 4.5, AttributeError on 5.1 — portable path is radius." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/gp-lineart-contour-hero.webp" />
-  <meta name="twitter:image:alt" content="gp-lineart-contour: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>gp-lineart-contour</h1>
     <p>Grease Pencil LINEART modifier contours via the depsgraph on a faceted crystal. source_object is load-bearing (clear yields 0 strokes); contour+crease off yields 0; restore recovers 10 strokes / 34 points on both 4.5.11 and 5.1.2. Stroke width: thickness exists on 4.5, AttributeError on 5.1 — portable path is radius.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom gp-lineart-contour render">
-      <img src="../assets/gp-lineart-contour-hero.webp" alt="gp-lineart-contour render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes.">
+      <img src="../assets/gp-lineart-contour-hero.webp" alt="A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> AI code still sets LINEART.thickness on 5.1 (AttributeError) or hand-draws strokes / enables Freestyle instead of modifiers.new(..., &#x27;LINEART&#x27;). Clearing source_object or leaving contour+crease off silently yields an empty drawing — the check proves both failure modes and recovery.</div>
@@ -766,7 +766,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/gp-lineart-contour-hero.webp" alt="gp-lineart-contour render, full size" />
+    <img src="../assets/gp-lineart-contour-hero.webp" alt="A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/grease-pencil-rosette/index.html b/docs/gallery/grease-pencil-rosette/index.html
index c2d65278..3c670f87 100644
--- a/docs/gallery/grease-pencil-rosette/index.html
+++ b/docs/gallery/grease-pencil-rosette/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/grease-pencil-rosette-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="grease-pencil-rosette: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="grease-pencil-rosette — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Grease Pencil v3&#x27;s attribute-based API — layer → frames.new(1).drawing → add_strokes → per-point position/radius/opacity/vertex_color — drawing five nested neon rose curves." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/grease-pencil-rosette-hero.webp" />
-  <meta name="twitter:image:alt" content="grease-pencil-rosette: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>grease-pencil-rosette</h1>
     <p>Grease Pencil v3&#x27;s attribute-based API — layer → frames.new(1).drawing → add_strokes → per-point position/radius/opacity/vertex_color — drawing five nested neon rose curves.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom grease-pencil-rosette render">
-      <img src="../assets/grease-pencil-rosette-hero.webp" alt="grease-pencil-rosette render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop.">
+      <img src="../assets/grease-pencil-rosette-hero.webp" alt="A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> The GPv3 address break: 4.5 keeps GPv3 at grease_pencils_v3 while grease_pencils is still legacy GPencil (frame.strokes, no .drawing); 5.x deletes legacy and GPv3 takes over the grease_pencils name. Point writes lazily materialize attribute layers, and every position round-trips through the raw POINT buffer.</div>
@@ -608,7 +608,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/grease-pencil-rosette-hero.webp" alt="grease-pencil-rosette render, full size" />
+    <img src="../assets/grease-pencil-rosette-hero.webp" alt="A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/grindstone/index.html b/docs/gallery/grindstone/index.html
index b7f34ecc..0bd6d448 100644
--- a/docs/gallery/grindstone/index.html
+++ b/docs/gallery/grindstone/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/grindstone-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="grindstone: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="grindstone — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural grindstone on a timber trestle through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/grindstone-hero.webp" />
-  <meta name="twitter:image:alt" content="grindstone: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>grindstone</h1>
     <p>A procedural grindstone on a timber trestle through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom grindstone render">
-      <img src="../assets/grindstone-hero.webp" alt="grindstone render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle.">
+      <img src="../assets/grindstone-hero.webp" alt="A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 928 tris, three materials with 216 wood / 160 stone / 180 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.710×0.419×0.610 m, zmin 0, hygiene 0, four shoes planted, trough seated in the sills, stone dip 26 mm, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 198 tris, non-empty glTF. --skip-decimate exits 9 on LOD1; --stray-vert exits 15 on hygiene; --lift-z / --short-legs exit 16 on grounded; --float-crank / --float-legs exit 17 on joint fit; --no-dip / --narrow-trough exit 18 on seat.</div>
@@ -1730,7 +1730,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/grindstone-hero.webp" alt="grindstone render, full size" />
+    <img src="../assets/grindstone-hero.webp" alt="A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/hand-pump/index.html b/docs/gallery/hand-pump/index.html
index e5439739..e58363ed 100644
--- a/docs/gallery/hand-pump/index.html
+++ b/docs/gallery/hand-pump/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hand-pump-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="hand-pump: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="hand-pump — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural village hand pump whose gooseneck is a 6-gon tube from the lower-column radius, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hand-pump-hero.webp" />
-  <meta name="twitter:image:alt" content="hand-pump: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>hand-pump</h1>
     <p>A procedural village hand pump whose gooseneck is a 6-gon tube from the lower-column radius, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom hand-pump render">
-      <img src="../assets/hand-pump-hero.webp" alt="hand-pump render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth.">
+      <img src="../assets/hand-pump-hero.webp" alt="A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1064 tris, two materials with 564 metal and 144 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.610×0.382×1.052 m, grounded zmin, spout-to-column gap 2.7 mm, flange-to-plinth gap 6.0 mm, column radius 62 mm, LOD ratios in band, convex collider 114 tris, hygiene all zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-spout 17; --float-flange 18; --skinny-col 19.</div>
@@ -1564,7 +1564,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/hand-pump-hero.webp" alt="hand-pump render, full size" />
+    <img src="../assets/hand-pump-hero.webp" alt="A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/hay-bale/index.html b/docs/gallery/hay-bale/index.html
index ea4c9274..c7e31232 100644
--- a/docs/gallery/hay-bale/index.html
+++ b/docs/gallery/hay-bale/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hay-bale-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="hay-bale: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A rectangular hay bale bound by two twine belts." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="hay-bale — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A bound hay bale whose twine belts follow the loaf&#x27;s own raycast cross-section, asserting recomputed geometry budgets, not an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hay-bale-hero.webp" />
-  <meta name="twitter:image:alt" content="hay-bale: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A rectangular hay bale bound by two twine belts." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>hay-bale</h1>
     <p>A bound hay bale whose twine belts follow the loaf&#x27;s own raycast cross-section, asserting recomputed geometry budgets, not an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom hay-bale render">
-      <img src="../assets/hay-bale-hero.webp" alt="hay-bale render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A rectangular hay bale bound by two twine belts.">
+      <img src="../assets/hay-bale-hero.webp" alt="A rectangular hay bale bound by two twine belts." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2012 tris, two materials with 712 hay and 304 twine faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.921x0.530x0.409 m, zmin 0, hygiene and cross-shell z-fight 0, 5 shells, each belt wrapping under the loaf at zmin 2.6 mm, banded belt seat depth 4.0-16.8 mm over 20/20 stations on both belts, belt mirror error 0, cinch depth 14.2 mm, LOD ratios in band, convex collider 156 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z and --float-belts 16; --slack-belt 18; --skew-belt 19.</div>
@@ -1786,7 +1786,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/hay-bale-hero.webp" alt="hay-bale render, full size" />
+    <img src="../assets/hay-bale-hero.webp" alt="A rectangular hay bale bound by two twine belts." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/hitching-post/index.html b/docs/gallery/hitching-post/index.html
index 8196045d..2f89b2ff 100644
--- a/docs/gallery/hitching-post/index.html
+++ b/docs/gallery/hitching-post/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hitching-post-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="hitching-post: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A tall wooden hitching post with a pointed cap, a crossbar and two iron rings." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="hitching-post — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural hitching post (eaved cap, one rail, cup shoe, rings hung through eyes) through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/hitching-post-hero.webp" />
-  <meta name="twitter:image:alt" content="hitching-post: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A tall wooden hitching post with a pointed cap, a crossbar and two iron rings." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>hitching-post</h1>
     <p>A procedural hitching post (eaved cap, one rail, cup shoe, rings hung through eyes) through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom hitching-post render">
-      <img src="../assets/hitching-post-hero.webp" alt="hitching-post render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A tall wooden hitching post with a pointed cap, a crossbar and two iron rings.">
+      <img src="../assets/hitching-post-hero.webp" alt="A tall wooden hitching post with a pointed cap, a crossbar and two iron rings." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1680 tris, two materials with 114 wood and 742 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.500×0.149×1.246 m, zmin 0, hygiene and coplanar pairs 0, post seated at z 0.010, ring centerline error 0, LOD ratios in band, convex collider 80 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert and --twin-sole exit 15; --lift-z exits 16; --clip-ring exits 18; --short-post exits 19.</div>
@@ -1710,7 +1710,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/hitching-post-hero.webp" alt="hitching-post render, full size" />
+    <img src="../assets/hitching-post-hero.webp" alt="A tall wooden hitching post with a pointed cap, a crossbar and two iron rings." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/image-pixels-testcard/index.html b/docs/gallery/image-pixels-testcard/index.html
index 060d2073..7dde54f2 100644
--- a/docs/gallery/image-pixels-testcard/index.html
+++ b/docs/gallery/image-pixels-testcard/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/image-pixels-testcard-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="image-pixels-testcard: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A monitor showing a colour-bar test card with a black circle and a greyscale strip." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="image-pixels-testcard — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The Image pixel-buffer contract — a procedural broadcast test card written into bpy.data.images.new() with one pixels.foreach_set (589,824 floats), byte vs float_buffer storage, scale() reallocation, and the save() vs save_render() lifecycle." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/image-pixels-testcard-hero.webp" />
-  <meta name="twitter:image:alt" content="image-pixels-testcard: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A monitor showing a colour-bar test card with a black circle and a greyscale strip." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>image-pixels-testcard</h1>
     <p>The Image pixel-buffer contract — a procedural broadcast test card written into bpy.data.images.new() with one pixels.foreach_set (589,824 floats), byte vs float_buffer storage, scale() reallocation, and the save() vs save_render() lifecycle.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom image-pixels-testcard render">
-      <img src="../assets/image-pixels-testcard-hero.webp" alt="image-pixels-testcard render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A monitor showing a colour-bar test card with a black circle and a greyscale strip.">
+      <img src="../assets/image-pixels-testcard-hero.webp" alt="A monitor showing a colour-bar test card with a black circle and a greyscale strip." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> pixels is always flat RGBA (channels == 4 even with alpha=False), byte storage quantizes at exactly ≤ 0.5/255 and strictly &gt; 0, stale-size bulk reads raise after scale() — and save() silently flips source to FILE and drops the buffer, so later pixels reads come from whatever sits on disk (proven with an imposter file).</div>
@@ -714,7 +714,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/image-pixels-testcard-hero.webp" alt="image-pixels-testcard render, full size" />
+    <img src="../assets/image-pixels-testcard-hero.webp" alt="A monitor showing a colour-bar test card with a black circle and a greyscale strip." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/index.html b/docs/gallery/index.html
index ef062116..7300cee3 100644
--- a/docs/gallery/index.html
+++ b/docs/gallery/index.html
@@ -343,7 +343,7 @@ <h1>Examples and Showcase</h1>
     <div class="grid" id="grid">
       <article class="card" data-tags="materials rendering">
         <a class="card-media" href="swatch-grid/" tabindex="-1" aria-hidden="true">
-          <img src="assets/swatch-grid-hero.webp" alt="swatch-grid — Procedural Principled materials — metal and dielectric, the emission pattern, and the cross-version set_specular shim." loading="lazy" decoding="async" />
+          <img src="assets/swatch-grid-hero.webp" alt="Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="swatch-grid/">swatch-grid</a></h2>
@@ -354,7 +354,7 @@ <h2><a href="swatch-grid/">swatch-grid</a></h2>
       </article>
       <article class="card" data-tags="animation">
         <a class="card-media" href="turntable/" tabindex="-1" aria-hidden="true">
-          <img src="assets/turntable-hero.webp" alt="turntable — A slotted-actions Z-rotation turntable keyed through the cross-version channelbag path (get_channelbag_for_slot)." loading="lazy" decoding="async" />
+          <img src="assets/turntable-hero.webp" alt="A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="turntable/">turntable</a></h2>
@@ -365,7 +365,7 @@ <h2><a href="turntable/">turntable</a></h2>
       </article>
       <article class="card" data-tags="geometry-nodes materials">
         <a class="card-media" href="gn-sdf-remesh/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gn-sdf-remesh-hero.webp" alt="gn-sdf-remesh — A Geometry Nodes SDF remesh (MeshToSDFGrid → GridToMesh at the SDF zero-level), with a Set Material node carrying the material through the remesh." loading="lazy" decoding="async" />
+          <img src="assets/gn-sdf-remesh-hero.webp" alt="A glossy red torus with visibly blocky voxel faceting from the SDF remesh." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gn-sdf-remesh/">gn-sdf-remesh</a></h2>
@@ -376,7 +376,7 @@ <h2><a href="gn-sdf-remesh/">gn-sdf-remesh</a></h2>
       </article>
       <article class="card" data-tags="depsgraph export">
         <a class="card-media" href="depsgraph-export/" tabindex="-1" aria-hidden="true">
-          <img src="assets/depsgraph-export-hero.webp" alt="depsgraph-export — The depsgraph lifetime contract — evaluated_get().to_mesh() paired with to_mesh_clear() — measured against an OBJ export of the same object." loading="lazy" decoding="async" />
+          <img src="assets/depsgraph-export-hero.webp" alt="A teal cube beside a slightly faceted teal sphere on a dark studio floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="depsgraph-export/">depsgraph-export</a></h2>
@@ -387,7 +387,7 @@ <h2><a href="depsgraph-export/">depsgraph-export</a></h2>
       </article>
       <article class="card" data-tags="mesh performance">
         <a class="card-media" href="wave-displace/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wave-displace-hero.webp" alt="wave-displace — Bulk vertex IO at real scale — 9,409 vertices displaced into a standing wave with one foreach_get and one foreach_set, no per-vertex access." loading="lazy" decoding="async" />
+          <img src="assets/wave-displace-hero.webp" alt="A blue grid surface displaced into rolling sine-wave hills." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wave-displace/">wave-displace</a></h2>
@@ -398,7 +398,7 @@ <h2><a href="wave-displace/">wave-displace</a></h2>
       </article>
       <article class="card" data-tags="drivers animation">
         <a class="card-media" href="driver-wave/" tabindex="-1" aria-hidden="true">
-          <img src="assets/driver-wave-hero.webp" alt="driver-wave — A driver_namespace function driving sixteen column heights through SCRIPTED drivers — the sine skyline is entirely driver-evaluated." loading="lazy" decoding="async" />
+          <img src="assets/driver-wave-hero.webp" alt="A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="driver-wave/">driver-wave</a></h2>
@@ -409,7 +409,7 @@ <h2><a href="driver-wave/">driver-wave</a></h2>
       </article>
       <article class="card" data-tags="mesh bmesh">
         <a class="card-media" href="bmesh-gear/" tabindex="-1" aria-hidden="true">
-          <img src="assets/bmesh-gear-hero.webp" alt="bmesh-gear — A 14-tooth gear built entirely with bmesh — profile ring, face, extrude — with bm.free() in a try/finally, exactly as the ownership contract demands." loading="lazy" decoding="async" />
+          <img src="assets/bmesh-gear-hero.webp" alt="A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="bmesh-gear/">bmesh-gear</a></h2>
@@ -420,7 +420,7 @@ <h2><a href="bmesh-gear/">bmesh-gear</a></h2>
       </article>
       <article class="card" data-tags="materials node-groups">
         <a class="card-media" href="shader-node-group/" tabindex="-1" aria-hidden="true">
-          <img src="assets/shader-node-group-hero.webp" alt="shader-node-group — One reusable shader group declared via tree.interface.new_socket, instanced in two materials with different Tint values — two spheres, one group, two colors." loading="lazy" decoding="async" />
+          <img src="assets/shader-node-group-hero.webp" alt="Two glossy spheres, one teal and one magenta, sharing one shader group." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="shader-node-group/">shader-node-group</a></h2>
@@ -431,7 +431,7 @@ <h2><a href="shader-node-group/">shader-node-group</a></h2>
       </article>
       <article class="card" data-tags="operators context">
         <a class="card-media" href="temp-override-join/" tabindex="-1" aria-hidden="true">
-          <img src="assets/temp-override-join-hero.webp" alt="temp-override-join — Join three unit cubes into a staircase under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form." loading="lazy" decoding="async" />
+          <img src="assets/temp-override-join-hero.webp" alt="Three orange cubes joined into a single diagonal staircase object." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="temp-override-join/">temp-override-join</a></h2>
@@ -442,7 +442,7 @@ <h2><a href="temp-override-join/">temp-override-join</a></h2>
       </article>
       <article class="card" data-tags="geometry-nodes instancing">
         <a class="card-media" href="gn-instance-grid/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gn-instance-grid-hero.webp" alt="gn-instance-grid — A generative Geometry Nodes tree — Mesh Grid → Instance on Points → Realize Instances → Set Shade Smooth — attached as a NODES modifier with no Group Input…" loading="lazy" decoding="async" />
+          <img src="assets/gn-instance-grid-hero.webp" alt="A three-by-three grid of green instanced cubes on a dark floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gn-instance-grid/">gn-instance-grid</a></h2>
@@ -453,7 +453,7 @@ <h2><a href="gn-instance-grid/">gn-instance-grid</a></h2>
       </article>
       <article class="card" data-tags="geometry-nodes modifiers">
         <a class="card-media" href="gn-modifier-inputs/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gn-modifier-inputs-hero.webp" alt="gn-modifier-inputs — Per-modifier Geometry Nodes Float inputs on a shared tree — 4.5/5.1 write mod[identifier], 5.2 writes mod.properties.inputs.Socket_1.value." loading="lazy" decoding="async" />
+          <img src="assets/gn-modifier-inputs-hero.webp" alt="Three boxes stepping up in size from a small teal cube to an orange block to a large red block." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gn-modifier-inputs/">gn-modifier-inputs</a></h2>
@@ -464,7 +464,7 @@ <h2><a href="gn-modifier-inputs/">gn-modifier-inputs</a></h2>
       </article>
       <article class="card" data-tags="mesh shape-keys">
         <a class="card-media" href="shape-key-blend/" tabindex="-1" aria-hidden="true">
-          <img src="assets/shape-key-blend-hero.webp" alt="shape-key-blend — A relative Tall shape key that lifts and flares the top face — authored via shape_key_add / key_blocks / .value — read back from the depsgraph-evaluated mesh." loading="lazy" decoding="async" />
+          <img src="assets/shape-key-blend-hero.webp" alt="Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="shape-key-blend/">shape-key-blend</a></h2>
@@ -475,7 +475,7 @@ <h2><a href="shape-key-blend/">shape-key-blend</a></h2>
       </article>
       <article class="card" data-tags="curves bevel">
         <a class="card-media" href="curve-bevel-arc/" tabindex="-1" aria-hidden="true">
-          <img src="assets/curve-bevel-arc-hero.webp" alt="curve-bevel-arc — A beveled Bezier semicircle authored on bpy.types.Curve — splines.new(&#x27;BEZIER&#x27;), bezier_points, bevel_depth, use_fill_caps — so the curve renders as a solid…" loading="lazy" decoding="async" />
+          <img src="assets/curve-bevel-arc-hero.webp" alt="A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="curve-bevel-arc/">curve-bevel-arc</a></h2>
@@ -486,7 +486,7 @@ <h2><a href="curve-bevel-arc/">curve-bevel-arc</a></h2>
       </article>
       <article class="card" data-tags="compositor rendering">
         <a class="card-media" href="compositor-glare/" tabindex="-1" aria-hidden="true">
-          <img src="assets/compositor-glare-hero.webp" alt="compositor-glare — Bloom where it actually lives — a compositor Glare (Fog Glow) node fed by Render Layers, wired via scene.compositing_node_group on 5.x and scene.node_tree on…" loading="lazy" decoding="async" />
+          <img src="assets/compositor-glare-hero.webp" alt="Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="compositor-glare/">compositor-glare</a></h2>
@@ -497,7 +497,7 @@ <h2><a href="compositor-glare/">compositor-glare</a></h2>
       </article>
       <article class="card" data-tags="constraints animation">
         <a class="card-media" href="damped-track-aim/" tabindex="-1" aria-hidden="true">
-          <img src="assets/damped-track-aim-hero.webp" alt="damped-track-aim — Aim constraints via the data API — Object.constraints.new(&#x27;DAMPED_TRACK&#x27;) with target and TRACK_Z, not bpy.ops.object.constraint_add in a headless loop." loading="lazy" decoding="async" />
+          <img src="assets/damped-track-aim-hero.webp" alt="Gold spikes arranged around a glowing sphere, every tip aimed at the sphere." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="damped-track-aim/">damped-track-aim</a></h2>
@@ -508,7 +508,7 @@ <h2><a href="damped-track-aim/">damped-track-aim</a></h2>
       </article>
       <article class="card" data-tags="mesh materials attributes">
         <a class="card-media" href="color-attribute-wheel/" tabindex="-1" aria-hidden="true">
-          <img src="assets/color-attribute-wheel-hero.webp" alt="color-attribute-wheel — The modern color-attributes API — mesh.color_attributes.new() on the CORNER domain, filled by expanding per-vertex HSV across face corners with…" loading="lazy" decoding="async" />
+          <img src="assets/color-attribute-wheel-hero.webp" alt="A disc painted with a full hue wheel that fades to white at the centre." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="color-attribute-wheel/">color-attribute-wheel</a></h2>
@@ -519,7 +519,7 @@ <h2><a href="color-attribute-wheel/">color-attribute-wheel</a></h2>
       </article>
       <article class="card" data-tags="objects transforms">
         <a class="card-media" href="parent-inverse-orrery/" tabindex="-1" aria-hidden="true">
-          <img src="assets/parent-inverse-orrery-hero.webp" alt="parent-inverse-orrery — Data-API parenting for a brass orrery — the keep-world idiom (child.parent = pivot; child.matrix_parent_inverse = pivot.matrix_world.inverted()) carrying arms…" loading="lazy" decoding="async" />
+          <img src="assets/parent-inverse-orrery-hero.webp" alt="A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="parent-inverse-orrery/">parent-inverse-orrery</a></h2>
@@ -530,7 +530,7 @@ <h2><a href="parent-inverse-orrery/">parent-inverse-orrery</a></h2>
       </article>
       <article class="card" data-tags="grease-pencil attributes">
         <a class="card-media" href="grease-pencil-rosette/" tabindex="-1" aria-hidden="true">
-          <img src="assets/grease-pencil-rosette-hero.webp" alt="grease-pencil-rosette — Grease Pencil v3&#x27;s attribute-based API — layer → frames.new(1).drawing → add_strokes → per-point position/radius/opacity/vertex_color — drawing five nested…" loading="lazy" decoding="async" />
+          <img src="assets/grease-pencil-rosette-hero.webp" alt="A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="grease-pencil-rosette/">grease-pencil-rosette</a></h2>
@@ -541,7 +541,7 @@ <h2><a href="grease-pencil-rosette/">grease-pencil-rosette</a></h2>
       </article>
       <article class="card" data-tags="armature depsgraph">
         <a class="card-media" href="armature-bend/" tabindex="-1" aria-hidden="true">
-          <img src="assets/armature-bend-hero.webp" alt="armature-bend — Rigging end to end in the data API — edit_bones chain construction, name-bound vertex groups with smoothstep blend zones, posing, and depsgraph evaluation…" loading="lazy" decoding="async" />
+          <img src="assets/armature-bend-hero.webp" alt="Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="armature-bend/">armature-bend</a></h2>
@@ -552,7 +552,7 @@ <h2><a href="armature-bend/">armature-bend</a></h2>
       </article>
       <article class="card" data-tags="curves depsgraph rendering">
         <a class="card-media" href="text-version-stamp/" tabindex="-1" aria-hidden="true">
-          <img src="assets/text-version-stamp-hero.webp" alt="text-version-stamp — The TextCurve data API — curves.new(type=&#x27;FONT&#x27;), live body text from bpy.app.version_string, extrude and bevel_depth solids, and evaluated-mesh conversion…" loading="lazy" decoding="async" />
+          <img src="assets/text-version-stamp-hero.webp" alt="The word BLENDER above the Blender version number in large gold 3D characters." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="text-version-stamp/">text-version-stamp</a></h2>
@@ -563,7 +563,7 @@ <h2><a href="text-version-stamp/">text-version-stamp</a></h2>
       </article>
       <article class="card" data-tags="images performance rendering">
         <a class="card-media" href="image-pixels-testcard/" tabindex="-1" aria-hidden="true">
-          <img src="assets/image-pixels-testcard-hero.webp" alt="image-pixels-testcard — The Image pixel-buffer contract — a procedural broadcast test card written into bpy.data.images.new() with one pixels.foreach_set (589,824 floats), byte vs…" loading="lazy" decoding="async" />
+          <img src="assets/image-pixels-testcard-hero.webp" alt="A monitor showing a colour-bar test card with a black circle and a greyscale strip." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="image-pixels-testcard/">image-pixels-testcard</a></h2>
@@ -574,7 +574,7 @@ <h2><a href="image-pixels-testcard/">image-pixels-testcard</a></h2>
       </article>
       <article class="card" data-tags="images rendering alpha">
         <a class="card-media" href="png-exr-alpha/" tabindex="-1" aria-hidden="true">
-          <img src="assets/png-exr-alpha-hero.webp" alt="png-exr-alpha — Float-image PNG save trap — float_buffer=True Image.save() writes RGBA16 and unpremultiplies as if associated-alpha, clamping straight-authored dark values at…" loading="lazy" decoding="async" />
+          <img src="assets/png-exr-alpha-hero.webp" alt="Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="png-exr-alpha/">png-exr-alpha</a></h2>
@@ -585,7 +585,7 @@ <h2><a href="png-exr-alpha/">png-exr-alpha</a></h2>
       </article>
       <article class="card" data-tags="mesh bmesh uv materials">
         <a class="card-media" href="uv-layer-grid/" tabindex="-1" aria-hidden="true">
-          <img src="assets/uv-layer-grid-hero.webp" alt="uv-layer-grid — The UV-layer authoring hazard — bmesh.ops.create_grid(..., calc_uvs=True) is a silent no-op unless a UV layer already exists; without one an Image Texture…" loading="lazy" decoding="async" />
+          <img src="assets/uv-layer-grid-hero.webp" alt="Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="uv-layer-grid/">uv-layer-grid</a></h2>
@@ -596,7 +596,7 @@ <h2><a href="uv-layer-grid/">uv-layer-grid</a></h2>
       </article>
       <article class="card" data-tags="sequencer rendering">
         <a class="card-media" href="vse-cut-list/" tabindex="-1" aria-hidden="true">
-          <img src="assets/vse-cut-list-hero.webp" alt="vse-cut-list — The sequencer API rename from 4.5 LTS to 5.x — strips (never .sequences), new_effect ending in length= vs frame_end=, and left_handle/right_handle/duration…" loading="lazy" decoding="async" />
+          <img src="assets/vse-cut-list-hero.webp" alt="A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="vse-cut-list/">vse-cut-list</a></h2>
@@ -607,7 +607,7 @@ <h2><a href="vse-cut-list/">vse-cut-list</a></h2>
       </article>
       <article class="card" data-tags="export uv">
         <a class="card-media" href="gltf-export-roundtrip/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gltf-export-roundtrip-hero.webp" alt="gltf-export-roundtrip — A sci-fi supply crate exported to glTF and re-imported, verifying the round-trip against the depsgraph-evaluated mesh within float tolerances." loading="lazy" decoding="async" />
+          <img src="assets/gltf-export-roundtrip-hero.webp" alt="Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gltf-export-roundtrip/">gltf-export-roundtrip</a></h2>
@@ -618,7 +618,7 @@ <h2><a href="gltf-export-roundtrip/">gltf-export-roundtrip</a></h2>
       </article>
       <article class="card" data-tags="export">
         <a class="card-media" href="export-preset-axis/" tabindex="-1" aria-hidden="true">
-          <img src="assets/export-preset-axis-hero.webp" alt="export-preset-axis — A radio beacon exported under Unity and Godot glTF presets and re-imported, proving the two files have different vertex orientation" loading="lazy" decoding="async" />
+          <img src="assets/export-preset-axis-hero.webp" alt="Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="export-preset-axis/">export-preset-axis</a></h2>
@@ -629,7 +629,7 @@ <h2><a href="export-preset-axis/">export-preset-axis</a></h2>
       </article>
       <article class="card" data-tags="depsgraph mesh">
         <a class="card-media" href="lod-decimate-chain/" tabindex="-1" aria-hidden="true">
-          <img src="assets/lod-decimate-chain-hero.webp" alt="lod-decimate-chain — A retro rocket at LOD0/1/2 via the Decimate modifier evaluated through the depsgraph." loading="lazy" decoding="async" />
+          <img src="assets/lod-decimate-chain-hero.webp" alt="Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="lod-decimate-chain/">lod-decimate-chain</a></h2>
@@ -640,7 +640,7 @@ <h2><a href="lod-decimate-chain/">lod-decimate-chain</a></h2>
       </article>
       <article class="card" data-tags="armature mesh">
         <a class="card-media" href="vertex-weight-limit/" tabindex="-1" aria-hidden="true">
-          <img src="assets/vertex-weight-limit-hero.webp" alt="vertex-weight-limit — A rigged mech arm pruned to the game-engine cap of four bone influences per vertex, through the data API." loading="lazy" decoding="async" />
+          <img src="assets/vertex-weight-limit-hero.webp" alt="A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="vertex-weight-limit/">vertex-weight-limit</a></h2>
@@ -651,7 +651,7 @@ <h2><a href="vertex-weight-limit/">vertex-weight-limit</a></h2>
       </article>
       <article class="card" data-tags="mesh uv">
         <a class="card-media" href="triangulate-tangents/" tabindex="-1" aria-hidden="true">
-          <img src="assets/triangulate-tangents-hero.webp" alt="triangulate-tangents — A machined buckler verifying the tangent-space contract a game engine&#x27;s normal mapping depends on." loading="lazy" decoding="async" />
+          <img src="assets/triangulate-tangents-hero.webp" alt="A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="triangulate-tangents/">triangulate-tangents</a></h2>
@@ -662,7 +662,7 @@ <h2><a href="triangulate-tangents/">triangulate-tangents</a></h2>
       </article>
       <article class="card" data-tags="export armature">
         <a class="card-media" href="gltf-skin-roundtrip/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gltf-skin-roundtrip-hero.webp" alt="gltf-skin-roundtrip — A rigged mech scorpion exported to glTF with skins and re-imported, verifying the skinning contract the geometry round-trip left uncovered." loading="lazy" decoding="async" />
+          <img src="assets/gltf-skin-roundtrip-hero.webp" alt="Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gltf-skin-roundtrip/">gltf-skin-roundtrip</a></h2>
@@ -673,7 +673,7 @@ <h2><a href="gltf-skin-roundtrip/">gltf-skin-roundtrip</a></h2>
       </article>
       <article class="card" data-tags="sequencer rendering">
         <a class="card-media" href="vse-gamma-cross/" tabindex="-1" aria-hidden="true">
-          <img src="assets/vse-gamma-cross-hero.webp" alt="vse-gamma-cross — The GAMMA_CROSS fade is not the naive linear mix: it blends in a gamma-0.5 space, so the mid-cross dips below the sRGB lerp." loading="lazy" decoding="async" />
+          <img src="assets/vse-gamma-cross-hero.webp" alt="A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="vse-gamma-cross/">vse-gamma-cross</a></h2>
@@ -684,7 +684,7 @@ <h2><a href="vse-gamma-cross/">vse-gamma-cross</a></h2>
       </article>
       <article class="card" data-tags="rendering objects">
         <a class="card-media" href="light-link-studio/" tabindex="-1" aria-hidden="true">
-          <img src="assets/light-link-studio-hero.webp" alt="light-link-studio — One key, one hero: a light linked to a receiver collection lights only the hero, proven by two pixel renders in one pass." loading="lazy" decoding="async" />
+          <img src="assets/light-link-studio-hero.webp" alt="Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="light-link-studio/">light-link-studio</a></h2>
@@ -695,7 +695,7 @@ <h2><a href="light-link-studio/">light-link-studio</a></h2>
       </article>
       <article class="card" data-tags="bmesh mesh">
         <a class="card-media" href="collision-hull-proxy/" tabindex="-1" aria-hidden="true">
-          <img src="assets/collision-hull-proxy-hero.webp" alt="collision-hull-proxy — A fire hydrant street prop inside its compound collision shell: four convex pieces hulled by bmesh.ops.convex_hull from a coarse inflated cage." loading="lazy" decoding="async" />
+          <img src="assets/collision-hull-proxy-hero.webp" alt="A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="collision-hull-proxy/">collision-hull-proxy</a></h2>
@@ -706,7 +706,7 @@ <h2><a href="collision-hull-proxy/">collision-hull-proxy</a></h2>
       </article>
       <article class="card" data-tags="mesh attributes">
         <a class="card-media" href="custom-normals-shade/" tabindex="-1" aria-hidden="true">
-          <img src="assets/custom-normals-shade-hero.webp" alt="custom-normals-shade — A jerry can prop shaded three ways to prove the post-4.1 shading contract: hard edges are mesh data, landing exactly where the dihedral crosses." loading="lazy" decoding="async" />
+          <img src="assets/custom-normals-shade-hero.webp" alt="Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="custom-normals-shade/">custom-normals-shade</a></h2>
@@ -717,7 +717,7 @@ <h2><a href="custom-normals-shade/">custom-normals-shade</a></h2>
       </article>
       <article class="card" data-tags="world sky rendering">
         <a class="card-media" href="sky-texture-sun-elevation/" tabindex="-1" aria-hidden="true">
-          <img src="assets/sky-texture-sun-elevation-hero.webp" alt="sky-texture-sun-elevation — World ShaderNodeTexSky driving Background Color — the sky contract across 4.5 LTS and 5.1." loading="lazy" decoding="async" />
+          <img src="assets/sky-texture-sun-elevation-hero.webp" alt="Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="sky-texture-sun-elevation/">sky-texture-sun-elevation</a></h2>
@@ -728,7 +728,7 @@ <h2><a href="sky-texture-sun-elevation/">sky-texture-sun-elevation</a></h2>
       </article>
       <article class="card" data-tags="grease-pencil line-art modifiers">
         <a class="card-media" href="gp-lineart-contour/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gp-lineart-contour-hero.webp" alt="gp-lineart-contour — Grease Pencil LINEART modifier contours via the depsgraph on a faceted crystal." loading="lazy" decoding="async" />
+          <img src="assets/gp-lineart-contour-hero.webp" alt="A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gp-lineart-contour/">gp-lineart-contour</a></h2>
@@ -739,7 +739,7 @@ <h2><a href="gp-lineart-contour/">gp-lineart-contour</a></h2>
       </article>
       <article class="card" data-tags="bmesh mesh game-pipeline">
         <a class="card-media" href="mesh-hygiene-audit/" tabindex="-1" aria-hidden="true">
-          <img src="assets/mesh-hygiene-audit-hero.webp" alt="mesh-hygiene-audit — Engine-ingest mesh hygiene on an octagonal street valve: no ngons, no loose verts, manifold edges, no zero-area faces, positive signed volume, Euler V-E+F==2." loading="lazy" decoding="async" />
+          <img src="assets/mesh-hygiene-audit-hero.webp" alt="Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="mesh-hygiene-audit/">mesh-hygiene-audit</a></h2>
@@ -750,7 +750,7 @@ <h2><a href="mesh-hygiene-audit/">mesh-hygiene-audit</a></h2>
       </article>
       <article class="card" data-tags="transforms parenting game-pipeline">
         <a class="card-media" href="prop-origin-transform/" tabindex="-1" aria-hidden="true">
-          <img src="assets/prop-origin-transform-hero.webp" alt="prop-origin-transform — Street pedestal origin-to-base-center + data-API scale apply + matrix_parent_inverse for a flanged conduit accessory." loading="lazy" decoding="async" />
+          <img src="assets/prop-origin-transform-hero.webp" alt="Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="prop-origin-transform/">prop-origin-transform</a></h2>
@@ -761,7 +761,7 @@ <h2><a href="prop-origin-transform/">prop-origin-transform</a></h2>
       </article>
       <article class="card" data-tags="bmesh mesh">
         <a class="card-media" href="soccer-ball-goldberg/" tabindex="-1" aria-hidden="true">
-          <img src="assets/soccer-ball-goldberg-hero.webp" alt="soccer-ball-goldberg — A soccer ball as a Goldberg polyhedron: a bmesh icosphere truncated at 1/3 per edge, faces ordered by link-topology walks, panels bound by face vertex count." loading="lazy" decoding="async" />
+          <img src="assets/soccer-ball-goldberg-hero.webp" alt="A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="soccer-ball-goldberg/">soccer-ball-goldberg</a></h2>
@@ -772,7 +772,7 @@ <h2><a href="soccer-ball-goldberg/">soccer-ball-goldberg</a></h2>
       </article>
       <article class="card" data-tags="modifiers depsgraph">
         <a class="card-media" href="car-mirror-symmetry/" tabindex="-1" aria-hidden="true">
-          <img src="assets/car-mirror-symmetry-hero.webp" alt="car-mirror-symmetry — A generic hatchback lofted as one half (14 stations, 9-point rings) and completed by the Mirror modifier, evaluated through the depsgraph." loading="lazy" decoding="async" />
+          <img src="assets/car-mirror-symmetry-hero.webp" alt="A red low-poly hatchback with white headlights, modelled as one mirrored half." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="car-mirror-symmetry/">car-mirror-symmetry</a></h2>
@@ -783,7 +783,7 @@ <h2><a href="car-mirror-symmetry/">car-mirror-symmetry</a></h2>
       </article>
       <article class="card" data-tags="attributes mesh rendering">
         <a class="card-media" href="attribute-domain-shear/" tabindex="-1" aria-hidden="true">
-          <img src="assets/attribute-domain-shear-hero.webp" alt="attribute-domain-shear — POINT vs CORNER color-attribute domains on a shared-vertex pinwheel: CORNER stays exact per face while a naive per-wedge POINT loop shears to the last write at…" loading="lazy" decoding="async" />
+          <img src="assets/attribute-domain-shear-hero.webp" alt="Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="attribute-domain-shear/">attribute-domain-shear</a></h2>
@@ -794,7 +794,7 @@ <h2><a href="attribute-domain-shear/">attribute-domain-shear</a></h2>
       </article>
       <article class="card" data-tags="bmesh mesh game-pipeline">
         <a class="card-media" href="degenerate-bevel-weld/" tabindex="-1" aria-hidden="true">
-          <img src="assets/degenerate-bevel-weld-hero.webp" alt="degenerate-bevel-weld — Bevel offset &gt;= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles…" loading="lazy" decoding="async" />
+          <img src="assets/degenerate-bevel-weld-hero.webp" alt="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="degenerate-bevel-weld/">degenerate-bevel-weld</a></h2>
@@ -805,7 +805,7 @@ <h2><a href="degenerate-bevel-weld/">degenerate-bevel-weld</a></h2>
       </article>
       <article class="card" data-tags="mesh bmesh game-pipeline instancing">
         <a class="card-media" href="modular-kit-snap/" tabindex="-1" aria-hidden="true">
-          <img src="assets/modular-kit-snap-hero.webp" alt="modular-kit-snap — A tiling corridor kit whose open-end boundary verts snap to the tile grid, so instances at 4 m multiples join with zero gap or overlap." loading="lazy" decoding="async" />
+          <img src="assets/modular-kit-snap-hero.webp" alt="A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="modular-kit-snap/">modular-kit-snap</a></h2>
@@ -816,7 +816,7 @@ <h2><a href="modular-kit-snap/">modular-kit-snap</a></h2>
       </article>
       <article class="card" data-tags="uv game-pipeline rendering">
         <a class="card-media" href="lightmap-uv-channel/" tabindex="-1" aria-hidden="true">
-          <img src="assets/lightmap-uv-channel-hero.webp" alt="lightmap-uv-channel — A market cart carrying the two-channel UV contract for baked lighting: UV0 untouched, UVLight packed with no overlaps and a respected margin." loading="lazy" decoding="async" />
+          <img src="assets/lightmap-uv-channel-hero.webp" alt="A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="lightmap-uv-channel/">lightmap-uv-channel</a></h2>
@@ -827,7 +827,7 @@ <h2><a href="lightmap-uv-channel/">lightmap-uv-channel</a></h2>
       </article>
       <article class="card" data-tags="mesh transforms game-pipeline instancing">
         <a class="card-media" href="socket-attach-points/" tabindex="-1" aria-hidden="true">
-          <img src="assets/socket-attach-points-hero.webp" alt="socket-attach-points — A survey drone whose named SKT_ empties are the spawn contract: modules parented with an identity local transform seat exactly on their mount pads." loading="lazy" decoding="async" />
+          <img src="assets/socket-attach-points-hero.webp" alt="A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="socket-attach-points/">socket-attach-points</a></h2>
@@ -838,7 +838,7 @@ <h2><a href="socket-attach-points/">socket-attach-points</a></h2>
       </article>
       <article class="card" data-tags="mesh attributes game-pipeline rendering">
         <a class="card-media" href="vertex-color-ao/" tabindex="-1" aria-hidden="true">
-          <img src="assets/vertex-color-ao-hero.webp" alt="vertex-color-ao — A stone well carrying baked ambient occlusion in a colour attribute, with the bake held to the closed-form hemisphere integral rather than to a captured value." loading="lazy" decoding="async" />
+          <img src="assets/vertex-color-ao-hero.webp" alt="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="vertex-color-ao/">vertex-color-ao</a></h2>
@@ -849,7 +849,7 @@ <h2><a href="vertex-color-ao/">vertex-color-ao</a></h2>
       </article>
       <article class="card" data-tags="context properties">
         <a class="card-media" href="cross-version-property-delete/" tabindex="-1" aria-hidden="true">
-          <img src="assets/cross-version-property-delete-hero.webp" alt="cross-version-property-delete — Custom ID properties are removed with del, not property_unset." loading="lazy" decoding="async" />
+          <img src="assets/cross-version-property-delete-hero.webp" alt="Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="cross-version-property-delete/">cross-version-property-delete</a></h2>
@@ -860,7 +860,7 @@ <h2><a href="cross-version-property-delete/">cross-version-property-delete</a></
       </article>
       <article class="card" data-tags="depsgraph export">
         <a class="card-media" href="usd-export-evaluation-mode/" tabindex="-1" aria-hidden="true">
-          <img src="assets/usd-export-evaluation-mode-hero.webp" alt="usd-export-evaluation-mode — The USD exporter evaluation_mode chooses viewport versus render modifier quality." loading="lazy" decoding="async" />
+          <img src="assets/usd-export-evaluation-mode-hero.webp" alt="Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="usd-export-evaluation-mode/">usd-export-evaluation-mode</a></h2>
@@ -871,7 +871,7 @@ <h2><a href="usd-export-evaluation-mode/">usd-export-evaluation-mode</a></h2>
       </article>
       <article class="card" data-tags="geometry-nodes">
         <a class="card-media" href="gn-zone-iterate/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gn-zone-iterate-hero.webp" alt="gn-zone-iterate — Repeat Zone and For Each Element only iterate after pair_with_output." loading="lazy" decoding="async" />
+          <img src="assets/gn-zone-iterate-hero.webp" alt="Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gn-zone-iterate/">gn-zone-iterate</a></h2>
@@ -882,7 +882,7 @@ <h2><a href="gn-zone-iterate/">gn-zone-iterate</a></h2>
       </article>
       <article class="card" data-tags="mesh">
         <a class="card-media" href="bake-normal-high-to-low/" tabindex="-1" aria-hidden="true">
-          <img src="assets/bake-normal-high-to-low-hero.webp" alt="bake-normal-high-to-low — A collapse-decimated hatch plate receiving a Cycles cage-baked tangent normal map from a ribbed high-poly source" loading="lazy" decoding="async" />
+          <img src="assets/bake-normal-high-to-low-hero.webp" alt="A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="bake-normal-high-to-low/">bake-normal-high-to-low</a></h2>
@@ -893,7 +893,7 @@ <h2><a href="bake-normal-high-to-low/">bake-normal-high-to-low</a></h2>
       </article>
       <article class="card" data-tags="geometry-nodes">
         <a class="card-media" href="gn-socket-rename/" tabindex="-1" aria-hidden="true">
-          <img src="assets/gn-socket-rename-hero.webp" alt="gn-socket-rename — Compare and Random Value socket identifiers collapsed onto reused names in 5.2; enabled-name lookup wires on 4.5, 5.1, and 5.2" loading="lazy" decoding="async" />
+          <img src="assets/gn-socket-rename-hero.webp" alt="A copper measuring column with graduated tick marks standing on a grey base plate." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="gn-socket-rename/">gn-socket-rename</a></h2>
@@ -904,7 +904,7 @@ <h2><a href="gn-socket-rename/">gn-socket-rename</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="shipping-crate/" tabindex="-1" aria-hidden="true">
-          <img src="assets/shipping-crate-hero.webp" alt="shipping-crate — A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/shipping-crate-hero.webp" alt="A wooden shipping crate with dark corner posts, horizontal planks and a metal handle." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="shipping-crate/">shipping-crate</a></h2>
@@ -915,7 +915,7 @@ <h2><a href="shipping-crate/">shipping-crate</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="stone-well/" tabindex="-1" aria-hidden="true">
-          <img src="assets/stone-well-hero.webp" alt="stone-well — A procedural stone well through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/stone-well-hero.webp" alt="A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="stone-well/">stone-well</a></h2>
@@ -926,7 +926,7 @@ <h2><a href="stone-well/">stone-well</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="wooden-barrel/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wooden-barrel-hero.webp" alt="wooden-barrel — A procedural wine-cask with croze-seated heads and chord-lofted hoops through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather…" loading="lazy" decoding="async" />
+          <img src="assets/wooden-barrel-hero.webp" alt="A wooden stave barrel bound by three metal hoops." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wooden-barrel/">wooden-barrel</a></h2>
@@ -937,7 +937,7 @@ <h2><a href="wooden-barrel/">wooden-barrel</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="campfire/" tabindex="-1" aria-hidden="true">
-          <img src="assets/campfire-hero.webp" alt="campfire — A procedural campfire through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/campfire-hero.webp" alt="A campfire of crossed logs in a teepee inside a ring of grey stone blocks." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="campfire/">campfire</a></h2>
@@ -948,7 +948,7 @@ <h2><a href="campfire/">campfire</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="market-stall/" tabindex="-1" aria-hidden="true">
-          <img src="assets/market-stall-hero.webp" alt="market-stall — A procedural timber market stall through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/market-stall-hero.webp" alt="A timber market stall with a red and white striped awning and a counter with shelves." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="market-stall/">market-stall</a></h2>
@@ -959,7 +959,7 @@ <h2><a href="market-stall/">market-stall</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="street-lantern/" tabindex="-1" aria-hidden="true">
-          <img src="assets/street-lantern-hero.webp" alt="street-lantern — A procedural hanging street lantern through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/street-lantern-hero.webp" alt="A black iron street lamp post with an arm holding a hanging lantern with glowing panes." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="street-lantern/">street-lantern</a></h2>
@@ -970,7 +970,7 @@ <h2><a href="street-lantern/">street-lantern</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="treasure-chest/" tabindex="-1" aria-hidden="true">
-          <img src="assets/treasure-chest-hero.webp" alt="treasure-chest — A procedural iron-bound chest with a lofted barrel-vault lid, U-wrap bands, and hinge knuckles through UVs, bake, LOD, collider, and Unity glTF, asserting…" loading="lazy" decoding="async" />
+          <img src="assets/treasure-chest-hero.webp" alt="An open wooden treasure chest with a vaulted lid and dark iron bands." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="treasure-chest/">treasure-chest</a></h2>
@@ -981,7 +981,7 @@ <h2><a href="treasure-chest/">treasure-chest</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="terrain-scatter/" tabindex="-1" aria-hidden="true">
-          <img src="assets/terrain-scatter-hero.webp" alt="terrain-scatter — A Geometry Nodes hill tile with seated icosphere scatter through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API…" loading="lazy" decoding="async" />
+          <img src="assets/terrain-scatter-hero.webp" alt="A square tile of sandy rolling terrain with pale rocks scattered on the hill." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="terrain-scatter/">terrain-scatter</a></h2>
@@ -992,7 +992,7 @@ <h2><a href="terrain-scatter/">terrain-scatter</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="fence-kit/" tabindex="-1" aria-hidden="true">
-          <img src="assets/fence-kit-hero.webp" alt="fence-kit — A procedural post-and-rail fence section whose brace is an oriented box between named post stations, through UVs, bake, LOD, collider, and Unity glTF…" loading="lazy" decoding="async" />
+          <img src="assets/fence-kit-hero.webp" alt="A section of wooden post-and-rail fence with a diagonal brace and dark iron collars." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="fence-kit/">fence-kit</a></h2>
@@ -1003,7 +1003,7 @@ <h2><a href="fence-kit/">fence-kit</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="watchtower/" tabindex="-1" aria-hidden="true">
-          <img src="assets/watchtower-hero.webp" alt="watchtower — A procedural timber watchtower through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/watchtower-hero.webp" alt="A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="watchtower/">watchtower</a></h2>
@@ -1014,7 +1014,7 @@ <h2><a href="watchtower/">watchtower</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="cart/" tabindex="-1" aria-hidden="true">
-          <img src="assets/cart-hero.webp" alt="cart — A procedural two-wheel wooden cart through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/cart-hero.webp" alt="A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="cart/">cart</a></h2>
@@ -1025,7 +1025,7 @@ <h2><a href="cart/">cart</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="park-bench/" tabindex="-1" aria-hidden="true">
-          <img src="assets/park-bench-hero.webp" alt="park-bench — A procedural wrought-iron park bench with tangent tube scroll feet through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than…" loading="lazy" decoding="async" />
+          <img src="assets/park-bench-hero.webp" alt="A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="park-bench/">park-bench</a></h2>
@@ -1036,7 +1036,7 @@ <h2><a href="park-bench/">park-bench</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="wheelbarrow/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wheelbarrow-hero.webp" alt="wheelbarrow — A procedural wooden wheelbarrow through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/wheelbarrow-hero.webp" alt="A wooden wheelbarrow with a box tray, spoked front wheel and two long handles." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wheelbarrow/">wheelbarrow</a></h2>
@@ -1047,7 +1047,7 @@ <h2><a href="wheelbarrow/">wheelbarrow</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="anvil/" tabindex="-1" aria-hidden="true">
-          <img src="assets/anvil-hero.webp" alt="anvil — A procedural blacksmith anvil on a timber stump through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/anvil-hero.webp" alt="A black iron anvil mounted on a hooped timber stump." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="anvil/">anvil</a></h2>
@@ -1058,7 +1058,7 @@ <h2><a href="anvil/">anvil</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="water-trough/" tabindex="-1" aria-hidden="true">
-          <img src="assets/water-trough-hero.webp" alt="water-trough — A procedural watertight water trough through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/water-trough-hero.webp" alt="A curved wooden water trough on crossed trestle legs, filled with dark green water." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="water-trough/">water-trough</a></h2>
@@ -1069,7 +1069,7 @@ <h2><a href="water-trough/">water-trough</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="hitching-post/" tabindex="-1" aria-hidden="true">
-          <img src="assets/hitching-post-hero.webp" alt="hitching-post — A procedural hitching post (eaved cap, one rail, cup shoe, rings hung through eyes) through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed…" loading="lazy" decoding="async" />
+          <img src="assets/hitching-post-hero.webp" alt="A tall wooden hitching post with a pointed cap, a crossbar and two iron rings." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="hitching-post/">hitching-post</a></h2>
@@ -1080,7 +1080,7 @@ <h2><a href="hitching-post/">hitching-post</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="grindstone/" tabindex="-1" aria-hidden="true">
-          <img src="assets/grindstone-hero.webp" alt="grindstone — A procedural grindstone on a timber trestle through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/grindstone-hero.webp" alt="A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="grindstone/">grindstone</a></h2>
@@ -1091,7 +1091,7 @@ <h2><a href="grindstone/">grindstone</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="hand-pump/" tabindex="-1" aria-hidden="true">
-          <img src="assets/hand-pump-hero.webp" alt="hand-pump — A procedural village hand pump whose gooseneck is a 6-gon tube from the lower-column radius, through UVs, bake, LOD, collider, and Unity glTF, asserting…" loading="lazy" decoding="async" />
+          <img src="assets/hand-pump-hero.webp" alt="A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="hand-pump/">hand-pump</a></h2>
@@ -1102,7 +1102,7 @@ <h2><a href="hand-pump/">hand-pump</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="signpost/" tabindex="-1" aria-hidden="true">
-          <img src="assets/signpost-hero.webp" alt="signpost — A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." loading="lazy" decoding="async" />
+          <img src="assets/signpost-hero.webp" alt="A wooden signpost with two pointed finger boards and dark iron bands on the post." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="signpost/">signpost</a></h2>
@@ -1113,7 +1113,7 @@ <h2><a href="signpost/">signpost</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="chopping-block/" tabindex="-1" aria-hidden="true">
-          <img src="assets/chopping-block-hero.webp" alt="chopping-block — A procedural log-round chopping block with a riveted iron hoop and a felling axe buried in the sawn face, through UVs, bake, LOD, collider, and Unity glTF…" loading="lazy" decoding="async" />
+          <img src="assets/chopping-block-hero.webp" alt="A log-round chopping block bound with an iron hoop, an axe buried in its top." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="chopping-block/">chopping-block</a></h2>
@@ -1124,7 +1124,7 @@ <h2><a href="chopping-block/">chopping-block</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="wooden-bucket/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wooden-bucket-hero.webp" alt="wooden-bucket — A procedural coopered pail with a croze-seated floor, chord-lofted hoops, and a round bail through the ear rings through UVs, bake, LOD, collider, and Unity…" loading="lazy" decoding="async" />
+          <img src="assets/wooden-bucket-hero.webp" alt="A wooden stave bucket with metal hoops and a curved wooden bail handle." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wooden-bucket/">wooden-bucket</a></h2>
@@ -1135,7 +1135,7 @@ <h2><a href="wooden-bucket/">wooden-bucket</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="wall-torch/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wall-torch-hero.webp" alt="wall-torch — A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity…" loading="lazy" decoding="async" />
+          <img src="assets/wall-torch-hero.webp" alt="A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wall-torch/">wall-torch</a></h2>
@@ -1146,7 +1146,7 @@ <h2><a href="wall-torch/">wall-torch</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="tavern-stool/" tabindex="-1" aria-hidden="true">
-          <img src="assets/tavern-stool-hero.webp" alt="tavern-stool — A procedural tavern stool with a lathed seat, turned splayed legs, tenoned stretchers, and iron ferrule cups through UVs, bake, LOD, collider, and Unity glTF…" loading="lazy" decoding="async" />
+          <img src="assets/tavern-stool-hero.webp" alt="A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="tavern-stool/">tavern-stool</a></h2>
@@ -1157,7 +1157,7 @@ <h2><a href="tavern-stool/">tavern-stool</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="iron-cauldron/" tabindex="-1" aria-hidden="true">
-          <img src="assets/iron-cauldron-hero.webp" alt="iron-cauldron — A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed…" loading="lazy" decoding="async" />
+          <img src="assets/iron-cauldron-hero.webp" alt="A black iron cauldron hanging from a tripod of wooden poles." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="iron-cauldron/">iron-cauldron</a></h2>
@@ -1168,7 +1168,7 @@ <h2><a href="iron-cauldron/">iron-cauldron</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="wooden-ladder/" tabindex="-1" aria-hidden="true">
-          <img src="assets/wooden-ladder-hero.webp" alt="wooden-ladder — A procedural timber ladder with raked tapered stiles, six turned rungs, ferrule caps, and level shoe plates through UVs, bake, LOD, collider, and Unity glTF…" loading="lazy" decoding="async" />
+          <img src="assets/wooden-ladder-hero.webp" alt="A wooden ladder with tapered stiles and round rungs, leaning at an angle." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="wooden-ladder/">wooden-ladder</a></h2>
@@ -1179,7 +1179,7 @@ <h2><a href="wooden-ladder/">wooden-ladder</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="hay-bale/" tabindex="-1" aria-hidden="true">
-          <img src="assets/hay-bale-hero.webp" alt="hay-bale — A bound hay bale whose twine belts follow the loaf&#x27;s own raycast cross-section, asserting recomputed geometry budgets, not an API contract." loading="lazy" decoding="async" />
+          <img src="assets/hay-bale-hero.webp" alt="A rectangular hay bale bound by two twine belts." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="hay-bale/">hay-bale</a></h2>
@@ -1190,7 +1190,7 @@ <h2><a href="hay-bale/">hay-bale</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="crate-stack/" tabindex="-1" aria-hidden="true">
-          <img src="assets/crate-stack-hero.webp" alt="crate-stack — A stack of three procedural shipping crates built by one generator called three times with a per-instance seed, carried through UVs, bake, LOD, collider, and…" loading="lazy" decoding="async" />
+          <img src="assets/crate-stack-hero.webp" alt="Three wooden shipping crates stacked, each turned slightly differently." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="crate-stack/">crate-stack</a></h2>
@@ -1201,7 +1201,7 @@ <h2><a href="crate-stack/">crate-stack</a></h2>
       </article>
       <article class="card" data-tags="mesh export showcase">
         <a class="card-media" href="stone-archway/" tabindex="-1" aria-hidden="true">
-          <img src="assets/stone-archway-hero.webp" alt="stone-archway — A procedural masonry archway — coursed piers, projecting imposts, nine voussoirs and a proud keystone — carried through UVs, bake, LOD, collider, and Unity…" loading="lazy" decoding="async" />
+          <img src="assets/stone-archway-hero.webp" alt="A freestanding stone archway of coursed piers and a semicircular arch with a keystone." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="stone-archway/">stone-archway</a></h2>
diff --git a/docs/gallery/iron-cauldron/index.html b/docs/gallery/iron-cauldron/index.html
index f3005fad..ed6f5fc5 100644
--- a/docs/gallery/iron-cauldron/index.html
+++ b/docs/gallery/iron-cauldron/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/iron-cauldron-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="iron-cauldron: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A black iron cauldron hanging from a tripod of wooden poles." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="iron-cauldron — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/iron-cauldron-hero.webp" />
-  <meta name="twitter:image:alt" content="iron-cauldron: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A black iron cauldron hanging from a tripod of wooden poles." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>iron-cauldron</h1>
     <p>A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom iron-cauldron render">
-      <img src="../assets/iron-cauldron-hero.webp" alt="iron-cauldron render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A black iron cauldron hanging from a tripod of wooden poles.">
+      <img src="../assets/iron-cauldron-hero.webp" alt="A black iron cauldron hanging from a tripod of wooden poles." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 3664 tris, two materials with 224 wood and 1768 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.987×0.961×0.860 m, pot–leg clearance 0.046 m, 3 coaxial ferrules at zmin 0, ferrule bite −0.00185 m, hook-bail join 0, mesh hygiene all zero, LOD ratios in band, convex collider 250 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --float-hook 17; --pipe-ferrule 18.</div>
@@ -1737,7 +1737,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/iron-cauldron-hero.webp" alt="iron-cauldron render, full size" />
+    <img src="../assets/iron-cauldron-hero.webp" alt="A black iron cauldron hanging from a tripod of wooden poles." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/light-link-studio/index.html b/docs/gallery/light-link-studio/index.html
index 5bb2c7de..90d4ee1e 100644
--- a/docs/gallery/light-link-studio/index.html
+++ b/docs/gallery/light-link-studio/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/light-link-studio-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="light-link-studio: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="light-link-studio — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="One key, one hero: a light linked to a receiver collection lights only the hero, proven by two pixel renders in one pass. Linked: 3.6x luminance ratio; unlinked in the same check: the decoy rises 233% while the hero holds at 0.3% drift." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/light-link-studio-hero.webp" />
-  <meta name="twitter:image:alt" content="light-link-studio: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>light-link-studio</h1>
     <p>One key, one hero: a light linked to a receiver collection lights only the hero, proven by two pixel renders in one pass. Linked: 3.6x luminance ratio; unlinked in the same check: the decoy rises 233% while the hero holds at 0.3% drift.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom light-link-studio render">
-      <img src="../assets/light-link-studio-hero.webp" alt="light-link-studio render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED.">
+      <img src="../assets/light-link-studio-hero.webp" alt="Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> The API is obj.light_linking on the light OBJECT (ld.light_linking is an AttributeError). Luminance is sampled at each sphere&#x27;s projected center; EEVEE honors linking too (probe-measured 3.8x on 4.5.11 EEVEE Next and 5.1.2 EEVEE), Cycles pinned for deterministic samples.</div>
@@ -740,7 +740,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/light-link-studio-hero.webp" alt="light-link-studio render, full size" />
+    <img src="../assets/light-link-studio-hero.webp" alt="Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/lightmap-uv-channel/index.html b/docs/gallery/lightmap-uv-channel/index.html
index 1050148a..2f41ce21 100644
--- a/docs/gallery/lightmap-uv-channel/index.html
+++ b/docs/gallery/lightmap-uv-channel/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/lightmap-uv-channel-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="lightmap-uv-channel: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="lightmap-uv-channel — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A market cart carrying the two-channel UV contract for baked lighting: UV0 untouched, UVLight packed with no overlaps and a respected margin." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/lightmap-uv-channel-hero.webp" />
-  <meta name="twitter:image:alt" content="lightmap-uv-channel: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>lightmap-uv-channel</h1>
     <p>A market cart carrying the two-channel UV contract for baked lighting: UV0 untouched, UVLight packed with no overlaps and a respected margin.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom lightmap-uv-channel render">
-      <img src="../assets/lightmap-uv-channel-hero.webp" alt="lightmap-uv-channel render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands.">
+      <img src="../assets/lightmap-uv-channel-hero.webp" alt="A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Per-part UVMap/UVLight with active vs active_render pinned (ops clear both flags), UV0 drift 0.0, 3680 islands with 0 SAT overlaps, min island distance 0.00401.</div>
@@ -1145,7 +1145,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/lightmap-uv-channel-hero.webp" alt="lightmap-uv-channel render, full size" />
+    <img src="../assets/lightmap-uv-channel-hero.webp" alt="A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/lod-decimate-chain/index.html b/docs/gallery/lod-decimate-chain/index.html
index 61fe146c..12a45f2f 100644
--- a/docs/gallery/lod-decimate-chain/index.html
+++ b/docs/gallery/lod-decimate-chain/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/lod-decimate-chain-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="lod-decimate-chain: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="lod-decimate-chain — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A retro rocket at LOD0/1/2 via the Decimate modifier evaluated through the depsgraph. The check proves the reduction is non-destructive, the triangle count hits ratio x base within bounds, and silhouette-critical dimensions survive." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/lod-decimate-chain-hero.webp" />
-  <meta name="twitter:image:alt" content="lod-decimate-chain: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>lod-decimate-chain</h1>
     <p>A retro rocket at LOD0/1/2 via the Decimate modifier evaluated through the depsgraph. The check proves the reduction is non-destructive, the triangle count hits ratio x base within bounds, and silhouette-critical dimensions survive.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom lod-decimate-chain render">
-      <img src="../assets/lod-decimate-chain-hero.webp" alt="lod-decimate-chain render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last.">
+      <img src="../assets/lod-decimate-chain-hero.webp" alt="Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Evaluated-vs-original: the depsgraph carries the reduction while obj.data keeps the closed-form counts. A stacked Decimate halves the effective ratio (caught); an aggressive ratio collapses the nose tip (caught).</div>
@@ -746,7 +746,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/lod-decimate-chain-hero.webp" alt="lod-decimate-chain render, full size" />
+    <img src="../assets/lod-decimate-chain-hero.webp" alt="Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/market-stall/index.html b/docs/gallery/market-stall/index.html
index 2f69ba3d..9d44304d 100644
--- a/docs/gallery/market-stall/index.html
+++ b/docs/gallery/market-stall/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/market-stall-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="market-stall: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A timber market stall with a red and white striped awning and a counter with shelves." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="market-stall — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural timber market stall through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/market-stall-hero.webp" />
-  <meta name="twitter:image:alt" content="market-stall: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A timber market stall with a red and white striped awning and a counter with shelves." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>market-stall</h1>
     <p>A procedural timber market stall through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom market-stall render">
-      <img src="../assets/market-stall-hero.webp" alt="market-stall render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A timber market stall with a red and white striped awning and a counter with shelves.">
+      <img src="../assets/market-stall-hero.webp" alt="A timber market stall with a red and white striped awning and a counter with shelves." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 4324 tris, three materials with 34 faces per awning stripe slot, UVs in 0..1 with zero AABB overlap, outer AABB 1.389×1.011×1.740 m, grounded zmin, 4 wrap feet, brace-counter overlap 0, awning seat 4 mm, post plumb 0, LOD ratios in band, convex collider 58 tris, non-empty glTF. Hygiene all zero. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-feet 16; --low-brace 17; --float-awning 18; --rake-posts 19.</div>
@@ -1616,7 +1616,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/market-stall-hero.webp" alt="market-stall render, full size" />
+    <img src="../assets/market-stall-hero.webp" alt="A timber market stall with a red and white striped awning and a counter with shelves." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/mesh-hygiene-audit/index.html b/docs/gallery/mesh-hygiene-audit/index.html
index 16d8f55b..29e9f8f4 100644
--- a/docs/gallery/mesh-hygiene-audit/index.html
+++ b/docs/gallery/mesh-hygiene-audit/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/mesh-hygiene-audit-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="mesh-hygiene-audit: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="mesh-hygiene-audit — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Engine-ingest mesh hygiene on an octagonal street valve: no ngons, no loose verts, manifold edges, no zero-area faces, positive signed volume, Euler V-E+F==2. Dual-panel still shows a through-hole and loose-vert bead derived from live mesh incidence — same brass on both so color alone cannot carry the proof." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/mesh-hygiene-audit-hero.webp" />
-  <meta name="twitter:image:alt" content="mesh-hygiene-audit: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>mesh-hygiene-audit</h1>
     <p>Engine-ingest mesh hygiene on an octagonal street valve: no ngons, no loose verts, manifold edges, no zero-area faces, positive signed volume, Euler V-E+F==2. Dual-panel still shows a through-hole and loose-vert bead derived from live mesh incidence — same brass on both so color alone cannot carry the proof.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom mesh-hygiene-audit render">
-      <img src="../assets/mesh-hygiene-audit-hero.webp" alt="mesh-hygiene-audit render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it.">
+      <img src="../assets/mesh-hygiene-audit-hero.webp" alt="Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Pipelines that skip topology gates ship open boundaries, loose verts, or non-sphere Euler into engine ingest. The still makes the boundary hole and loose vert readable; ngon / zero-area / full winding invert remain check-only.</div>
@@ -919,7 +919,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/mesh-hygiene-audit-hero.webp" alt="mesh-hygiene-audit render, full size" />
+    <img src="../assets/mesh-hygiene-audit-hero.webp" alt="Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/modular-kit-snap/index.html b/docs/gallery/modular-kit-snap/index.html
index f53785c8..36af3e8e 100644
--- a/docs/gallery/modular-kit-snap/index.html
+++ b/docs/gallery/modular-kit-snap/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/modular-kit-snap-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="modular-kit-snap: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="modular-kit-snap — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A tiling corridor kit whose open-end boundary verts snap to the tile grid, so instances at 4 m multiples join with zero gap or overlap." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/modular-kit-snap-hero.webp" />
-  <meta name="twitter:image:alt" content="modular-kit-snap: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>modular-kit-snap</h1>
     <p>A tiling corridor kit whose open-end boundary verts snap to the tile grid, so instances at 4 m multiples join with zero gap or overlap.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom modular-kit-snap render">
-      <img src="../assets/modular-kit-snap-hero.webp" alt="modular-kit-snap render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end.">
+      <img src="../assets/modular-kit-snap-hero.webp" alt="A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> 16 boundary verts on x∈{0,4} within 1e-6 m, linked-duplicate joint deviation 0.0, bbox == declared tile; unsnapped probe fails at 3e-3 m.</div>
@@ -994,7 +994,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/modular-kit-snap-hero.webp" alt="modular-kit-snap render, full size" />
+    <img src="../assets/modular-kit-snap-hero.webp" alt="A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/parent-inverse-orrery/index.html b/docs/gallery/parent-inverse-orrery/index.html
index c77ee480..4c8b9b96 100644
--- a/docs/gallery/parent-inverse-orrery/index.html
+++ b/docs/gallery/parent-inverse-orrery/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/parent-inverse-orrery-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="parent-inverse-orrery: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="parent-inverse-orrery — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Data-API parenting for a brass orrery — the keep-world idiom (child.parent = pivot; child.matrix_parent_inverse = pivot.matrix_world.inverted()) carrying arms, planets, and a two-level moon through spinning pivots." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/parent-inverse-orrery-hero.webp" />
-  <meta name="twitter:image:alt" content="parent-inverse-orrery: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>parent-inverse-orrery</h1>
     <p>Data-API parenting for a brass orrery — the keep-world idiom (child.parent = pivot; child.matrix_parent_inverse = pivot.matrix_world.inverted()) carrying arms, planets, and a two-level moon through spinning pivots.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom parent-inverse-orrery render">
-      <img src="../assets/parent-inverse-orrery-hero.webp" alt="parent-inverse-orrery render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings.">
+      <img src="../assets/parent-inverse-orrery-hero.webp" alt="A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Bare `.parent =` really does teleport the child; the idiom restores world position exactly; matrix_world stays stale until view_layer.update(); every orbit lands on its closed form.</div>
@@ -663,7 +663,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/parent-inverse-orrery-hero.webp" alt="parent-inverse-orrery render, full size" />
+    <img src="../assets/parent-inverse-orrery-hero.webp" alt="A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/park-bench/index.html b/docs/gallery/park-bench/index.html
index 191cd420..73435f01 100644
--- a/docs/gallery/park-bench/index.html
+++ b/docs/gallery/park-bench/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/park-bench-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="park-bench: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="park-bench — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural wrought-iron park bench with tangent tube scroll feet through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/park-bench-hero.webp" />
-  <meta name="twitter:image:alt" content="park-bench: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>park-bench</h1>
     <p>A procedural wrought-iron park bench with tangent tube scroll feet through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom park-bench render">
-      <img src="../assets/park-bench-hero.webp" alt="park-bench render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests.">
+      <img src="../assets/park-bench-hero.webp" alt="A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2520 tris, two materials with 540 metal and 756 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.295×0.632×0.884 m, grounded zmin, 4 named toes, stretcher gap 1.2 mm, slat gap 0.3 mm, seat span 1.272 m, LOD ratios in band, convex collider 82 tris, hygiene zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-feet 16; --float-stretcher 17; --gap-slats 18; --narrow-seat 19.</div>
@@ -1475,7 +1475,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/park-bench-hero.webp" alt="park-bench render, full size" />
+    <img src="../assets/park-bench-hero.webp" alt="A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/png-exr-alpha/index.html b/docs/gallery/png-exr-alpha/index.html
index 4ec01429..697a4a0d 100644
--- a/docs/gallery/png-exr-alpha/index.html
+++ b/docs/gallery/png-exr-alpha/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/png-exr-alpha-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="png-exr-alpha: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="png-exr-alpha — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Float-image PNG save trap — float_buffer=True Image.save() writes RGBA16 and unpremultiplies as if associated-alpha, clamping straight-authored dark values at low alpha to white (closed-form err 0.98 at RGB 0.02 / a=1/255)." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/png-exr-alpha-hero.webp" />
-  <meta name="twitter:image:alt" content="png-exr-alpha: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>png-exr-alpha</h1>
     <p>Float-image PNG save trap — float_buffer=True Image.save() writes RGBA16 and unpremultiplies as if associated-alpha, clamping straight-authored dark values at low alpha to white (closed-form err 0.98 at RGB 0.02 / a=1/255).</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom png-exr-alpha render">
-      <img src="../assets/png-exr-alpha-hero.webp" alt="png-exr-alpha render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side.">
+      <img src="../assets/png-exr-alpha-hero.webp" alt="Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> float→PNG IHDR is RGBA16 and matches q16(min(1, c/q16(a))); OpenEXR round-trips within 1e-5; byte→PNG is straight RGBA8; EXR color_mode=RGB drops alpha to opaque.</div>
@@ -997,7 +997,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/png-exr-alpha-hero.webp" alt="png-exr-alpha render, full size" />
+    <img src="../assets/png-exr-alpha-hero.webp" alt="Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/prop-origin-transform/index.html b/docs/gallery/prop-origin-transform/index.html
index 4a9566df..aad15ec8 100644
--- a/docs/gallery/prop-origin-transform/index.html
+++ b/docs/gallery/prop-origin-transform/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/prop-origin-transform-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="prop-origin-transform: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="prop-origin-transform — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Street pedestal origin-to-base-center + data-API scale apply + matrix_parent_inverse for a flanged conduit accessory. After bake: scale (1,1,1), local min.z==0, world AABB unchanged. Bare parent jumps the accessory off an empty mount socket; MPI keeps it seated." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/prop-origin-transform-hero.webp" />
-  <meta name="twitter:image:alt" content="prop-origin-transform: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>prop-origin-transform</h1>
     <p>Street pedestal origin-to-base-center + data-API scale apply + matrix_parent_inverse for a flanged conduit accessory. After bake: scale (1,1,1), local min.z==0, world AABB unchanged. Bare parent jumps the accessory off an empty mount socket; MPI keeps it seated.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom prop-origin-transform render">
-      <img src="../assets/prop-origin-transform-hero.webp" alt="prop-origin-transform render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated.">
+      <img src="../assets/prop-origin-transform-hero.webp" alt="Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Bare child.parent = parent teleports accessories off their mounts; skipping view_layer.update() before matrix_world, or leaving non-uniform scale / centered origin, breaks engine ingest placement.</div>
@@ -951,7 +951,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/prop-origin-transform-hero.webp" alt="prop-origin-transform render, full size" />
+    <img src="../assets/prop-origin-transform-hero.webp" alt="Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/shader-node-group/index.html b/docs/gallery/shader-node-group/index.html
index 205dcf18..0955a70d 100644
--- a/docs/gallery/shader-node-group/index.html
+++ b/docs/gallery/shader-node-group/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shader-node-group-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="shader-node-group: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two glossy spheres, one teal and one magenta, sharing one shader group." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="shader-node-group — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="One reusable shader group declared via tree.interface.new_socket, instanced in two materials with different Tint values — two spheres, one group, two colors." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shader-node-group-hero.webp" />
-  <meta name="twitter:image:alt" content="shader-node-group: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two glossy spheres, one teal and one magenta, sharing one shader group." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>shader-node-group</h1>
     <p>One reusable shader group declared via tree.interface.new_socket, instanced in two materials with different Tint values — two spheres, one group, two colors.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom shader-node-group render">
-      <img src="../assets/shader-node-group-hero.webp" alt="shader-node-group render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two glossy spheres, one teal and one magenta, sharing one shader group.">
+      <img src="../assets/shader-node-group-hero.webp" alt="Two glossy spheres, one teal and one magenta, sharing one shader group." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Grouping contract: interface sockets appear on every instance, both materials share one group datablock (users == 2), and per-material parameters live on the group node, not inside the tree.</div>
@@ -538,7 +538,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/shader-node-group-hero.webp" alt="shader-node-group render, full size" />
+    <img src="../assets/shader-node-group-hero.webp" alt="Two glossy spheres, one teal and one magenta, sharing one shader group." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/shape-key-blend/index.html b/docs/gallery/shape-key-blend/index.html
index a3da30a6..eba301c0 100644
--- a/docs/gallery/shape-key-blend/index.html
+++ b/docs/gallery/shape-key-blend/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shape-key-blend-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="shape-key-blend: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="shape-key-blend — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A relative Tall shape key that lifts and flares the top face — authored via shape_key_add / key_blocks / .value — read back from the depsgraph-evaluated mesh." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shape-key-blend-hero.webp" />
-  <meta name="twitter:image:alt" content="shape-key-blend: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>shape-key-blend</h1>
     <p>A relative Tall shape key that lifts and flares the top face — authored via shape_key_add / key_blocks / .value — read back from the depsgraph-evaluated mesh.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom shape-key-blend render">
-      <img src="../assets/shape-key-blend-hero.webp" alt="shape-key-blend render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare.">
+      <img src="../assets/shape-key-blend-hero.webp" alt="Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Shape keys do not rewrite mesh.vertices: every evaluated vert matches basis + value × (key − basis), including the flared top half-extent.</div>
@@ -581,7 +581,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/shape-key-blend-hero.webp" alt="shape-key-blend render, full size" />
+    <img src="../assets/shape-key-blend-hero.webp" alt="Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/shipping-crate/index.html b/docs/gallery/shipping-crate/index.html
index 2b13f981..1e10a902 100644
--- a/docs/gallery/shipping-crate/index.html
+++ b/docs/gallery/shipping-crate/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shipping-crate-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="shipping-crate: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden shipping crate with dark corner posts, horizontal planks and a metal handle." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="shipping-crate — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/shipping-crate-hero.webp" />
-  <meta name="twitter:image:alt" content="shipping-crate: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden shipping crate with dark corner posts, horizontal planks and a metal handle." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>shipping-crate</h1>
     <p>A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom shipping-crate render">
-      <img src="../assets/shipping-crate-hero.webp" alt="shipping-crate render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden shipping crate with dark corner posts, horizontal planks and a metal handle.">
+      <img src="../assets/shipping-crate-hero.webp" alt="A wooden shipping crate with dark corner posts, horizontal planks and a metal handle." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2508 tris, two materials with 1170 wood and 280 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.146×0.726×0.612 m, grounded zmin, 3 skids, handle-end and slat-post join 0, mesh hygiene all zero, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 76 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-skids 16; --float-handle 17; --omit-slats 18.</div>
@@ -1581,7 +1581,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/shipping-crate-hero.webp" alt="shipping-crate render, full size" />
+    <img src="../assets/shipping-crate-hero.webp" alt="A wooden shipping crate with dark corner posts, horizontal planks and a metal handle." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/signpost/index.html b/docs/gallery/signpost/index.html
index 6d80dd03..47c4a86f 100644
--- a/docs/gallery/signpost/index.html
+++ b/docs/gallery/signpost/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/signpost-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="signpost: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden signpost with two pointed finger boards and dark iron bands on the post." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="signpost — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/signpost-hero.webp" />
-  <meta name="twitter:image:alt" content="signpost: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden signpost with two pointed finger boards and dark iron bands on the post." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>signpost</h1>
     <p>A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom signpost render">
-      <img src="../assets/signpost-hero.webp" alt="signpost render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden signpost with two pointed finger boards and dark iron bands on the post.">
+      <img src="../assets/signpost-hero.webp" alt="A wooden signpost with two pointed finger boards and dark iron bands on the post." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 376 tris, three materials with 108 metal, 22 board and 60 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.260×0.142×1.551 m at zmin 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD1/LOD2), convex collider 52 tris, non-empty glTF. Hygiene all zero. Board-to-post gap 5 mm, strap gap 3 mm, board AABB Y 28 mm. --skip-decimate exits 9; --stray-vert 15; --lift-z / --short-shoe 16; --gap-board 17; --float-strap 18; --yaw-boards 19.</div>
@@ -1391,7 +1391,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/signpost-hero.webp" alt="signpost render, full size" />
+    <img src="../assets/signpost-hero.webp" alt="A wooden signpost with two pointed finger boards and dark iron bands on the post." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/sky-texture-sun-elevation/index.html b/docs/gallery/sky-texture-sun-elevation/index.html
index 7980c4c7..400f8d95 100644
--- a/docs/gallery/sky-texture-sun-elevation/index.html
+++ b/docs/gallery/sky-texture-sun-elevation/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/sky-texture-sun-elevation-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="sky-texture-sun-elevation: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="sky-texture-sun-elevation — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="World ShaderNodeTexSky driving Background Color — the sky contract across 4.5 LTS and 5.1. sky_type is NISHITA on 4.5 and MULTIPLE_SCATTERING on 5.1 (NISHITA gone); dust_density exists only on 4.5 (aerosol_density on 5.1). Two tiny Cycles OPEN_EXR zenith probes prove sun_elevation 8 deg to 55 deg brightens zenith (rise 2.25x on 5.1.2, 1.50x on 4.5.11, gate &gt;= 1.25)." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/sky-texture-sun-elevation-hero.webp" />
-  <meta name="twitter:image:alt" content="sky-texture-sun-elevation: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>sky-texture-sun-elevation</h1>
     <p>World ShaderNodeTexSky driving Background Color — the sky contract across 4.5 LTS and 5.1. sky_type is NISHITA on 4.5 and MULTIPLE_SCATTERING on 5.1 (NISHITA gone); dust_density exists only on 4.5 (aerosol_density on 5.1). Two tiny Cycles OPEN_EXR zenith probes prove sun_elevation 8 deg to 55 deg brightens zenith (rise 2.25x on 5.1.2, 1.50x on 4.5.11, gate &gt;= 1.25).</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom sky-texture-sun-elevation render">
-      <img src="../assets/sky-texture-sun-elevation-hero.webp" alt="sky-texture-sun-elevation render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right.">
+      <img src="../assets/sky-texture-sun-elevation-hero.webp" alt="Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> AI code still assigns sky_type=&#x27;NISHITA&#x27; and dust_density on 5.1 — both are wrong (NISHITA removed; dust_density is AttributeError; use MULTIPLE_SCATTERING + aerosol_density). A near-black Background Strength alone is not a sky: Sky must link into Background Color. Elevation that does not brighten zenith fails the rise gate.</div>
@@ -858,7 +858,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/sky-texture-sun-elevation-hero.webp" alt="sky-texture-sun-elevation render, full size" />
+    <img src="../assets/sky-texture-sun-elevation-hero.webp" alt="Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/soccer-ball-goldberg/index.html b/docs/gallery/soccer-ball-goldberg/index.html
index 308cf3d2..347ddc4d 100644
--- a/docs/gallery/soccer-ball-goldberg/index.html
+++ b/docs/gallery/soccer-ball-goldberg/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/soccer-ball-goldberg-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="soccer-ball-goldberg: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="soccer-ball-goldberg — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A soccer ball as a Goldberg polyhedron: a bmesh icosphere truncated at 1/3 per edge, faces ordered by link-topology walks, panels bound by face vertex count." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/soccer-ball-goldberg-hero.webp" />
-  <meta name="twitter:image:alt" content="soccer-ball-goldberg: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>soccer-ball-goldberg</h1>
     <p>A soccer ball as a Goldberg polyhedron: a bmesh icosphere truncated at 1/3 per edge, faces ordered by link-topology walks, panels bound by face vertex count.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom soccer-ball-goldberg render">
-      <img src="../assets/soccer-ball-goldberg-hero.webp" alt="soccer-ball-goldberg render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron.">
+      <img src="../assets/soccer-ball-goldberg-hero.webp" alt="A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Goldberg invariants are closed forms — counts, degree 3, uniform edges, planar faces, one circumsphere — and panels bind by vertex count, never enumeration order.</div>
@@ -731,7 +731,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/soccer-ball-goldberg-hero.webp" alt="soccer-ball-goldberg render, full size" />
+    <img src="../assets/soccer-ball-goldberg-hero.webp" alt="A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/socket-attach-points/index.html b/docs/gallery/socket-attach-points/index.html
index 20f0da80..285b125b 100644
--- a/docs/gallery/socket-attach-points/index.html
+++ b/docs/gallery/socket-attach-points/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/socket-attach-points-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="socket-attach-points: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="socket-attach-points — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A survey drone whose named SKT_ empties are the spawn contract: modules parented with an identity local transform seat exactly on their mount pads." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/socket-attach-points-hero.webp" />
-  <meta name="twitter:image:alt" content="socket-attach-points: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>socket-attach-points</h1>
     <p>A survey drone whose named SKT_ empties are the spawn contract: modules parented with an identity local transform seat exactly on their mount pads.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom socket-attach-points render">
-      <img src="../assets/socket-attach-points-hero.webp" alt="socket-attach-points render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts.">
+      <img src="../assets/socket-attach-points-hero.webp" alt="A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> 7 socket world matrices within 1.788e-07 of the authored transform, socket +Z == the pad&#x27;s Newell normal (1.794e-07), seating offset 0.0; the no-parent-inverse probe jumps 0.690128 m.</div>
@@ -1449,7 +1449,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/socket-attach-points-hero.webp" alt="socket-attach-points render, full size" />
+    <img src="../assets/socket-attach-points-hero.webp" alt="A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/stone-archway/index.html b/docs/gallery/stone-archway/index.html
index 4a239b39..52bcb061 100644
--- a/docs/gallery/stone-archway/index.html
+++ b/docs/gallery/stone-archway/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/stone-archway-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="stone-archway: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A freestanding stone archway of coursed piers and a semicircular arch with a keystone." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="stone-archway — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural masonry archway — coursed piers, projecting imposts, nine voussoirs and a proud keystone — carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/stone-archway-hero.webp" />
-  <meta name="twitter:image:alt" content="stone-archway: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A freestanding stone archway of coursed piers and a semicircular arch with a keystone." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>stone-archway</h1>
     <p>A procedural masonry archway — coursed piers, projecting imposts, nine voussoirs and a proud keystone — carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom stone-archway render">
-      <img src="../assets/stone-archway-hero.webp" alt="stone-archway render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A freestanding stone archway of coursed piers and a semicircular arch with a keystone.">
+      <img src="../assets/stone-archway-hero.webp" alt="A freestanding stone archway of coursed piers and a semicircular arch with a keystone." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 924 tris, two materials with 182 dressed and 364 ashlar faces re-stamped after the chamfer, UVs in 0..1 with zero AABB overlap, outer AABB 1.644×0.510×2.057 m, clear opening 1.203 m, zmin 0, hygiene 0 including zero coplanar disjoint pairs, both piers grounded, the springing joint an overlap, all eight mortar joints at 9.70 mm inside the 6–17 mm band, and every intrados vertex within 0.97 mm of the declared 0.60 m radius over 178°. --off-circle exits 19 on the circle fit; --wide-mortar exits 18 on the joint band.</div>
@@ -1549,7 +1549,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/stone-archway-hero.webp" alt="stone-archway render, full size" />
+    <img src="../assets/stone-archway-hero.webp" alt="A freestanding stone archway of coursed piers and a semicircular arch with a keystone." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/stone-well/index.html b/docs/gallery/stone-well/index.html
index 255033a6..98e7b464 100644
--- a/docs/gallery/stone-well/index.html
+++ b/docs/gallery/stone-well/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/stone-well-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="stone-well: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="stone-well — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural stone well through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/stone-well-hero.webp" />
-  <meta name="twitter:image:alt" content="stone-well: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>stone-well</h1>
     <p>A procedural stone well through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom stone-well render">
-      <img src="../assets/stone-well-hero.webp" alt="stone-well render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside.">
+      <img src="../assets/stone-well-hero.webp" alt="A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 9380 tris, three materials with face floors, UVs in 0..1 with zero AABB overlap, outer AABB 1.312×1.312×1.761 m, LOD ratios in band, convex collider 346 tris, hygiene zero (loose, non-manifold, doubles, n-gons), zero coplanar cross-shell face pairs, all 12 bottom-course stones on the floor, each post tenoned 18 mm into the measured coping and standing under a roof hip corner, the bucket hanging 0.10 m clear of the coping, grounded zmin, non-empty glTF. --stand-posts exits 15 on the z-fight budget; --float-stone exits 16 on the named-support budget; --shallow-tenon and --drop-bucket exit 18; --turn-posts exits 19 on post placement; --skip-decimate exits 9 on the LOD1 ratio budget; --lift-z exits 16 on the grounded budget.</div>
@@ -1866,7 +1866,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/stone-well-hero.webp" alt="stone-well render, full size" />
+    <img src="../assets/stone-well-hero.webp" alt="A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/street-lantern/index.html b/docs/gallery/street-lantern/index.html
index 1a7ce236..ba673b8c 100644
--- a/docs/gallery/street-lantern/index.html
+++ b/docs/gallery/street-lantern/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/street-lantern-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="street-lantern: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A black iron street lamp post with an arm holding a hanging lantern with glowing panes." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="street-lantern — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural hanging street lantern through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/street-lantern-hero.webp" />
-  <meta name="twitter:image:alt" content="street-lantern: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A black iron street lamp post with an arm holding a hanging lantern with glowing panes." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>street-lantern</h1>
     <p>A procedural hanging street lantern through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom street-lantern render">
-      <img src="../assets/street-lantern-hero.webp" alt="street-lantern render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A black iron street lamp post with an arm holding a hanging lantern with glowing panes.">
+      <img src="../assets/street-lantern-hero.webp" alt="A black iron street lamp post with an arm holding a hanging lantern with glowing panes." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 3338 tris, three materials with 1530 metal, 24 glass and 209 brass faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.300×0.786×1.287 m, zmin 0, hygiene 0, brace BVH gap 0, hanger-roof gap −1 mm, post 0.100×1.120 m plumb 0, LOD ratios in band (5.2 COLLAPSE 2 tris leaner on LOD2), convex collider 78 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-brace 17; --sink-arm 18; --rake-post 19.</div>
@@ -1691,7 +1691,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/street-lantern-hero.webp" alt="street-lantern render, full size" />
+    <img src="../assets/street-lantern-hero.webp" alt="A black iron street lamp post with an arm holding a hanging lantern with glowing panes." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/swatch-grid/index.html b/docs/gallery/swatch-grid/index.html
index ed2895fc..d49fca53 100644
--- a/docs/gallery/swatch-grid/index.html
+++ b/docs/gallery/swatch-grid/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/swatch-grid-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="swatch-grid: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="swatch-grid — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Procedural Principled materials — metal and dielectric, the emission pattern, and the cross-version set_specular shim." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/swatch-grid-hero.webp" />
-  <meta name="twitter:image:alt" content="swatch-grid: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>swatch-grid</h1>
     <p>Procedural Principled materials — metal and dielectric, the emission pattern, and the cross-version set_specular shim.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom swatch-grid render">
-      <img src="../assets/swatch-grid-hero.webp" alt="swatch-grid render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white.">
+      <img src="../assets/swatch-grid-hero.webp" alt="Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> EEVEE engine-id mapping: BLENDER_EEVEE on 5.x, BLENDER_EEVEE_NEXT on 4.2–4.5.</div>
@@ -648,7 +648,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/swatch-grid-hero.webp" alt="swatch-grid render, full size" />
+    <img src="../assets/swatch-grid-hero.webp" alt="Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/tavern-stool/index.html b/docs/gallery/tavern-stool/index.html
index 95a0e54e..a391ec72 100644
--- a/docs/gallery/tavern-stool/index.html
+++ b/docs/gallery/tavern-stool/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/tavern-stool-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="tavern-stool: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="tavern-stool — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural tavern stool with a lathed seat, turned splayed legs, tenoned stretchers, and iron ferrule cups through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/tavern-stool-hero.webp" />
-  <meta name="twitter:image:alt" content="tavern-stool: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>tavern-stool</h1>
     <p>A procedural tavern stool with a lathed seat, turned splayed legs, tenoned stretchers, and iron ferrule cups through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom tavern-stool render">
-      <img src="../assets/tavern-stool-hero.webp" alt="tavern-stool render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs.">
+      <img src="../assets/tavern-stool-hero.webp" alt="A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2528 tris, two materials with 1168 wood and 256 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.340×0.340×0.470 m, LOD ratios in band, convex collider 396 tris, non-empty glTF. Hygiene all zero, four ferrule cups at zmin 0, stretcher-leg gap 0, ferrule clearance −1.25 mm. --float-stretchers exits 17 on the stretcher join; --pipe-ferrule exits 18 on the ferrule bite band.</div>
@@ -1547,7 +1547,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/tavern-stool-hero.webp" alt="tavern-stool render, full size" />
+    <img src="../assets/tavern-stool-hero.webp" alt="A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/temp-override-join/index.html b/docs/gallery/temp-override-join/index.html
index 9703ccc4..e830386e 100644
--- a/docs/gallery/temp-override-join/index.html
+++ b/docs/gallery/temp-override-join/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/temp-override-join-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="temp-override-join: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Three orange cubes joined into a single diagonal staircase object." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="temp-override-join — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Join three unit cubes into a staircase under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/temp-override-join-hero.webp" />
-  <meta name="twitter:image:alt" content="temp-override-join: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Three orange cubes joined into a single diagonal staircase object." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>temp-override-join</h1>
     <p>Join three unit cubes into a staircase under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom temp-override-join render">
-      <img src="../assets/temp-override-join-hero.webp" alt="temp-override-join render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Three orange cubes joined into a single diagonal staircase object.">
+      <img src="../assets/temp-override-join-hero.webp" alt="Three orange cubes joined into a single diagonal staircase object." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> temp_override actually applies: join consumes the sources, exactly one mesh remains, topology is verts = 8 × steps, and local Z spans all three steps.</div>
@@ -546,7 +546,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/temp-override-join-hero.webp" alt="temp-override-join render, full size" />
+    <img src="../assets/temp-override-join-hero.webp" alt="Three orange cubes joined into a single diagonal staircase object." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/terrain-scatter/index.html b/docs/gallery/terrain-scatter/index.html
index e50cf389..056d0277 100644
--- a/docs/gallery/terrain-scatter/index.html
+++ b/docs/gallery/terrain-scatter/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/terrain-scatter-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="terrain-scatter: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A square tile of sandy rolling terrain with pale rocks scattered on the hill." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="terrain-scatter — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A Geometry Nodes hill tile with seated icosphere scatter through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/terrain-scatter-hero.webp" />
-  <meta name="twitter:image:alt" content="terrain-scatter: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A square tile of sandy rolling terrain with pale rocks scattered on the hill." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>terrain-scatter</h1>
     <p>A Geometry Nodes hill tile with seated icosphere scatter through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom terrain-scatter render">
-      <img src="../assets/terrain-scatter-hero.webp" alt="terrain-scatter render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A square tile of sandy rolling terrain with pale rocks scattered on the hill.">
+      <img src="../assets/terrain-scatter-hero.webp" alt="A square tile of sandy rolling terrain with pale rocks scattered on the hill." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1758 tris, two materials with 720 stone faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.800×1.800×0.552 m, grounded zmin, 9 stones of ≥80 faces seated on sampled dirt Z (offset −35 mm, floor zmin 0.113 m), LOD ratios in band, convex collider 81 tris, hygiene zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --poke-rock 17; --float-rocks 18; --box-rocks 19.</div>
@@ -1497,7 +1497,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/terrain-scatter-hero.webp" alt="terrain-scatter render, full size" />
+    <img src="../assets/terrain-scatter-hero.webp" alt="A square tile of sandy rolling terrain with pale rocks scattered on the hill." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/text-version-stamp/index.html b/docs/gallery/text-version-stamp/index.html
index 40698c55..a774d92d 100644
--- a/docs/gallery/text-version-stamp/index.html
+++ b/docs/gallery/text-version-stamp/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/text-version-stamp-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="text-version-stamp: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="The word BLENDER above the Blender version number in large gold 3D characters." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="text-version-stamp — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The TextCurve data API — curves.new(type=&#x27;FONT&#x27;), live body text from bpy.app.version_string, extrude and bevel_depth solids, and evaluated-mesh conversion — so every render self-documents which Blender produced it." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/text-version-stamp-hero.webp" />
-  <meta name="twitter:image:alt" content="text-version-stamp: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="The word BLENDER above the Blender version number in large gold 3D characters." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>text-version-stamp</h1>
     <p>The TextCurve data API — curves.new(type=&#x27;FONT&#x27;), live body text from bpy.app.version_string, extrude and bevel_depth solids, and evaluated-mesh conversion — so every render self-documents which Blender produced it.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom text-version-stamp render">
-      <img src="../assets/text-version-stamp-hero.webp" alt="text-version-stamp render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: The word BLENDER above the Blender version number in large gold 3D characters.">
+      <img src="../assets/text-version-stamp-hero.webp" alt="The word BLENDER above the Blender version number in large gold 3D characters." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> TextCurve solids are exactly predictable: evaluated z-extent = 2 × (extrude + bevel_depth), bevel widens the outline by 2 × bevel_depth, editing body regenerates geometry — and version_string is not bare semver on LTS (&quot;4.5.11 LTS&quot;), so parse bpy.app.version instead.</div>
@@ -625,7 +625,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/text-version-stamp-hero.webp" alt="text-version-stamp render, full size" />
+    <img src="../assets/text-version-stamp-hero.webp" alt="The word BLENDER above the Blender version number in large gold 3D characters." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/treasure-chest/index.html b/docs/gallery/treasure-chest/index.html
index 31198456..f798872c 100644
--- a/docs/gallery/treasure-chest/index.html
+++ b/docs/gallery/treasure-chest/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/treasure-chest-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="treasure-chest: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="An open wooden treasure chest with a vaulted lid and dark iron bands." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="treasure-chest — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural iron-bound chest with a lofted barrel-vault lid, U-wrap bands, and hinge knuckles through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/treasure-chest-hero.webp" />
-  <meta name="twitter:image:alt" content="treasure-chest: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="An open wooden treasure chest with a vaulted lid and dark iron bands." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>treasure-chest</h1>
     <p>A procedural iron-bound chest with a lofted barrel-vault lid, U-wrap bands, and hinge knuckles through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom treasure-chest render">
-      <img src="../assets/treasure-chest-hero.webp" alt="treasure-chest render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: An open wooden treasure chest with a vaulted lid and dark iron bands.">
+      <img src="../assets/treasure-chest-hero.webp" alt="An open wooden treasure chest with a vaulted lid and dark iron bands." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 3852 tris, two materials with 1608 wood and 318 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.764×0.542×0.691 m, LOD ratios in band, convex collider 176 tris, non-empty glTF. Hygiene all zero, four feet at zmin 0, lid-knuckle to hinge barrel 7 mm, band-wall gap 0. --float-hinge exits 17 on the hinge join; --narrow-bands exits 18 on the band seat.</div>
@@ -1633,7 +1633,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/treasure-chest-hero.webp" alt="treasure-chest render, full size" />
+    <img src="../assets/treasure-chest-hero.webp" alt="An open wooden treasure chest with a vaulted lid and dark iron bands." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/triangulate-tangents/index.html b/docs/gallery/triangulate-tangents/index.html
index c5295c42..b2df4349 100644
--- a/docs/gallery/triangulate-tangents/index.html
+++ b/docs/gallery/triangulate-tangents/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/triangulate-tangents-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="triangulate-tangents: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="triangulate-tangents — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A machined buckler verifying the tangent-space contract a game engine&#x27;s normal mapping depends on. Deterministic triangulation, unit orthogonal tangent frames, and the edge/UV-delta formula matching mikktspace within welding tolerance." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/triangulate-tangents-hero.webp" />
-  <meta name="twitter:image:alt" content="triangulate-tangents: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>triangulate-tangents</h1>
     <p>A machined buckler verifying the tangent-space contract a game engine&#x27;s normal mapping depends on. Deterministic triangulation, unit orthogonal tangent frames, and the edge/UV-delta formula matching mikktspace within welding tolerance.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom triangulate-tangents render">
-      <img src="../assets/triangulate-tangents-hero.webp" alt="triangulate-tangents render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight.">
+      <img src="../assets/triangulate-tangents-hero.webp" alt="A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> calc_tangents aborts on any ngon; planar UVs on a cylindrical wall collapse tangents onto normals; a MeshUVLoopLayer handle held across calc_tangents dangles on 4.5 (471 phantom flips, silent exit 0) while the mikktspace math is byte-identical on both versions.</div>
@@ -771,7 +771,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/triangulate-tangents-hero.webp" alt="triangulate-tangents render, full size" />
+    <img src="../assets/triangulate-tangents-hero.webp" alt="A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/turntable/index.html b/docs/gallery/turntable/index.html
index 96f0c84d..eaf719e1 100644
--- a/docs/gallery/turntable/index.html
+++ b/docs/gallery/turntable/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/turntable-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="turntable: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="turntable — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A slotted-actions Z-rotation turntable keyed through the cross-version channelbag path (get_channelbag_for_slot)." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/turntable-hero.webp" />
-  <meta name="twitter:image:alt" content="turntable: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>turntable</h1>
     <p>A slotted-actions Z-rotation turntable keyed through the cross-version channelbag path (get_channelbag_for_slot).</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom turntable render">
-      <img src="../assets/turntable-hero.webp" alt="turntable render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor.">
+      <img src="../assets/turntable-hero.webp" alt="A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Slotted-actions boundary: ensure-helper channelbag on 5.x, strip.channelbag on 4.4/4.5.</div>
@@ -469,7 +469,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/turntable-hero.webp" alt="turntable render, full size" />
+    <img src="../assets/turntable-hero.webp" alt="A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/usd-export-evaluation-mode/index.html b/docs/gallery/usd-export-evaluation-mode/index.html
index 024b727f..a624f24e 100644
--- a/docs/gallery/usd-export-evaluation-mode/index.html
+++ b/docs/gallery/usd-export-evaluation-mode/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/usd-export-evaluation-mode-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="usd-export-evaluation-mode: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="usd-export-evaluation-mode — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The USD exporter evaluation_mode chooses viewport versus render modifier quality. TESSELLATE makes the split observable; BEST_MATCH writes the cage and the mode is silent." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/usd-export-evaluation-mode-hero.webp" />
-  <meta name="twitter:image:alt" content="usd-export-evaluation-mode: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>usd-export-evaluation-mode</h1>
     <p>The USD exporter evaluation_mode chooses viewport versus render modifier quality. TESSELLATE makes the split observable; BEST_MATCH writes the cage and the mode is silent.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom usd-export-evaluation-mode render">
-      <img src="../assets/usd-export-evaluation-mode-hero.webp" alt="usd-export-evaluation-mode render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right.">
+      <img src="../assets/usd-export-evaluation-mode-hero.webp" alt="Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> TESSELLATE+VIEWPORT writes 26/24; TESSELLATE+RENDER writes 98/96 subdivisionScheme=none; BEST_MATCH writes the 8-vert catmullClark cage. --evaluation-mode VIEWPORT and --subdivision BEST_MATCH exit 4.</div>
@@ -649,7 +649,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/usd-export-evaluation-mode-hero.webp" alt="usd-export-evaluation-mode render, full size" />
+    <img src="../assets/usd-export-evaluation-mode-hero.webp" alt="Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/uv-layer-grid/index.html b/docs/gallery/uv-layer-grid/index.html
index 45766445..e59e0341 100644
--- a/docs/gallery/uv-layer-grid/index.html
+++ b/docs/gallery/uv-layer-grid/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/uv-layer-grid-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="uv-layer-grid: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="uv-layer-grid — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The UV-layer authoring hazard — bmesh.ops.create_grid(..., calc_uvs=True) is a silent no-op unless a UV layer already exists; without one an Image Texture samples texel (0,0) everywhere." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/uv-layer-grid-hero.webp" />
-  <meta name="twitter:image:alt" content="uv-layer-grid: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>uv-layer-grid</h1>
     <p>The UV-layer authoring hazard — bmesh.ops.create_grid(..., calc_uvs=True) is a silent no-op unless a UV layer already exists; without one an Image Texture samples texel (0,0) everywhere.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom uv-layer-grid render">
-      <img src="../assets/uv-layer-grid-hero.webp" alt="uv-layer-grid render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker.">
+      <img src="../assets/uv-layer-grid-hero.webp" alt="Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> calc_uvs=True alone leaves 0 UV layers; pre-create + calc_uvs fills loops to the closed-form grid UVs ((x/size+1)/2, (y/size+1)/2) within 1e-6; explicit loop assignment is the calc_uvs-free fallback. The still is self-witnessing: the script re-reads its render and exits non-zero unless the hazard panel is one flat teal and the repaired panel a high-contrast checker.</div>
@@ -849,7 +849,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/uv-layer-grid-hero.webp" alt="uv-layer-grid render, full size" />
+    <img src="../assets/uv-layer-grid-hero.webp" alt="Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/vertex-color-ao/index.html b/docs/gallery/vertex-color-ao/index.html
index d8931150..a810c927 100644
--- a/docs/gallery/vertex-color-ao/index.html
+++ b/docs/gallery/vertex-color-ao/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vertex-color-ao-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="vertex-color-ao: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="vertex-color-ao — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A stone well carrying baked ambient occlusion in a colour attribute, with the bake held to the closed-form hemisphere integral rather than to a captured value." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vertex-color-ao-hero.webp" />
-  <meta name="twitter:image:alt" content="vertex-color-ao: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>vertex-color-ao</h1>
     <p>A stone well carrying baked ambient occlusion in a colour attribute, with the bake held to the closed-form hemisphere integral rather than to a captured value.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom vertex-color-ao render">
-      <img src="../assets/vertex-color-ao-hero.webp" alt="vertex-color-ao render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion.">
+      <img src="../assets/vertex-color-ao-hero.webp" alt="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Integrator matches 1 - 0.5(1 - 1/sqrt(1+k^2)) to 6.760e-04, unoccluded plate exactly 1.0, FLOAT_COLOR exact vs BYTE_COLOR sRGB-quantised (model agreement 3.189e-07), evaluated deviation 0.0.</div>
@@ -1265,7 +1265,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/vertex-color-ao-hero.webp" alt="vertex-color-ao render, full size" />
+    <img src="../assets/vertex-color-ao-hero.webp" alt="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/vertex-weight-limit/index.html b/docs/gallery/vertex-weight-limit/index.html
index 06288774..cc265dce 100644
--- a/docs/gallery/vertex-weight-limit/index.html
+++ b/docs/gallery/vertex-weight-limit/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vertex-weight-limit-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="vertex-weight-limit: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="vertex-weight-limit — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="A rigged mech arm pruned to the game-engine cap of four bone influences per vertex, through the data API. The check proves no vertex exceeds the cap, weights still sum to one, the pose survives pruning, and the modifier is still exact linear blend skinning." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vertex-weight-limit-hero.webp" />
-  <meta name="twitter:image:alt" content="vertex-weight-limit: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>vertex-weight-limit</h1>
     <p>A rigged mech arm pruned to the game-engine cap of four bone influences per vertex, through the data API. The check proves no vertex exceeds the cap, weights still sum to one, the pose survives pruning, and the modifier is still exact linear blend skinning.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom vertex-weight-limit render">
-      <img src="../assets/vertex-weight-limit-hero.webp" alt="vertex-weight-limit render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints.">
+      <img src="../assets/vertex-weight-limit-hero.webp" alt="A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Limit-total and normalize without bpy.ops: keep the top four groups, VertexGroup.remove the rest, renormalize. LBS is verified against the weights read back from the mesh&#x27;s own deform layer, not the authoring function.</div>
@@ -830,7 +830,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/vertex-weight-limit-hero.webp" alt="vertex-weight-limit render, full size" />
+    <img src="../assets/vertex-weight-limit-hero.webp" alt="A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/vse-cut-list/index.html b/docs/gallery/vse-cut-list/index.html
index dc151b97..edb89c07 100644
--- a/docs/gallery/vse-cut-list/index.html
+++ b/docs/gallery/vse-cut-list/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vse-cut-list-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="vse-cut-list: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="vse-cut-list — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The sequencer API rename from 4.5 LTS to 5.x — strips (never .sequences), new_effect ending in length= vs frame_end=, and left_handle/right_handle/duration replacing the deprecated frame_final_*. A deterministic cut list — color programs, a clamped GAMMA_CROSS, a scene strip, a text strip — asserted before and after save/reload." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vse-cut-list-hero.webp" />
-  <meta name="twitter:image:alt" content="vse-cut-list: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>vse-cut-list</h1>
     <p>The sequencer API rename from 4.5 LTS to 5.x — strips (never .sequences), new_effect ending in length= vs frame_end=, and left_handle/right_handle/duration replacing the deprecated frame_final_*. A deterministic cut list — color programs, a clamped GAMMA_CROSS, a scene strip, a text strip — asserted before and after save/reload.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom vse-cut-list render">
-      <img src="../assets/vse-cut-list-hero.webp" alt="vse-cut-list render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip.">
+      <img src="../assets/vse-cut-list-hero.webp" alt="A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Each side hard-fails the other&#x27;s spelling: TypeError on the wrong end kwarg, AttributeError on .sequences. The cross clamps to the source overlap, effect strips consume their inputs only when stacked above them, and a same-scene scene strip renders transparent.</div>
@@ -1054,7 +1054,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/vse-cut-list-hero.webp" alt="vse-cut-list render, full size" />
+    <img src="../assets/vse-cut-list-hero.webp" alt="A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/vse-gamma-cross/index.html b/docs/gallery/vse-gamma-cross/index.html
index b082ecd4..31953e3c 100644
--- a/docs/gallery/vse-gamma-cross/index.html
+++ b/docs/gallery/vse-gamma-cross/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vse-gamma-cross-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="vse-gamma-cross: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="vse-gamma-cross — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="The GAMMA_CROSS fade is not the naive linear mix: it blends in a gamma-0.5 space, so the mid-cross dips below the sRGB lerp. Tiny per-frame renders are asserted against the closed form per frame." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/vse-gamma-cross-hero.webp" />
-  <meta name="twitter:image:alt" content="vse-gamma-cross: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>vse-gamma-cross</h1>
     <p>The GAMMA_CROSS fade is not the naive linear mix: it blends in a gamma-0.5 space, so the mid-cross dips below the sRGB lerp. Tiny per-frame renders are asserted against the closed form per frame.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom vse-gamma-cross render">
-      <img src="../assets/vse-gamma-cross-hero.webp" alt="vse-gamma-cross render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange.">
+      <img src="../assets/vse-gamma-cross-hero.webp" alt="A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> out = ((1-t)*sqrt(A) + t*sqrt(B))^2 with t = (frame - start) / duration, never 1 inside the effect. The mid lerp deviation is 0.115; AgX-default sampling poisons the fit (Standard is mandatory).</div>
@@ -768,7 +768,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/vse-gamma-cross-hero.webp" alt="vse-gamma-cross render, full size" />
+    <img src="../assets/vse-gamma-cross-hero.webp" alt="A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wall-torch/index.html b/docs/gallery/wall-torch/index.html
index a1336816..7f697ba3 100644
--- a/docs/gallery/wall-torch/index.html
+++ b/docs/gallery/wall-torch/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wall-torch-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wall-torch: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wall-torch — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wall-torch-hero.webp" />
-  <meta name="twitter:image:alt" content="wall-torch: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wall-torch</h1>
     <p>A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wall-torch render">
-      <img src="../assets/wall-torch-hero.webp" alt="wall-torch render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor.">
+      <img src="../assets/wall-torch-hero.webp" alt="A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 1528 tris, four materials with 540 stone, 228 metal and 78 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.304×0.293×0.424 m at zmin 0, LOD ratios in band, convex collider 60 tris, non-empty glTF. Hygiene all zero. Arm-to-cup gap 0.87 mm, plate-to-plaque gap 4 mm, plaque width 0.280 m. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-arm 17; --float-plate 18; --skinny-plaque 19.</div>
@@ -1424,7 +1424,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wall-torch-hero.webp" alt="wall-torch render, full size" />
+    <img src="../assets/wall-torch-hero.webp" alt="A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/watchtower/index.html b/docs/gallery/watchtower/index.html
index c461e5df..aa6390f5 100644
--- a/docs/gallery/watchtower/index.html
+++ b/docs/gallery/watchtower/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/watchtower-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="watchtower: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="watchtower — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural timber watchtower through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/watchtower-hero.webp" />
-  <meta name="twitter:image:alt" content="watchtower: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>watchtower</h1>
     <p>A procedural timber watchtower through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom watchtower render">
-      <img src="../assets/watchtower-hero.webp" alt="watchtower render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof.">
+      <img src="../assets/watchtower-hero.webp" alt="A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 6408 tris, three materials with 300 metal and 126 roof faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.594×1.594×2.973 m, grounded zmin, 4 iron shoes, rail engage 18 mm, collar standoff 2 mm, post plumb 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 150 tris, non-empty glTF. Hygiene all zero. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-shoes 16; --short-rails 17; --float-band 18; --rake-posts 19.</div>
@@ -1687,7 +1687,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/watchtower-hero.webp" alt="watchtower render, full size" />
+    <img src="../assets/watchtower-hero.webp" alt="A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/water-trough/index.html b/docs/gallery/water-trough/index.html
index a7b67ba3..cc744d90 100644
--- a/docs/gallery/water-trough/index.html
+++ b/docs/gallery/water-trough/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/water-trough-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="water-trough: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A curved wooden water trough on crossed trestle legs, filled with dark green water." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="water-trough — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural watertight water trough through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/water-trough-hero.webp" />
-  <meta name="twitter:image:alt" content="water-trough: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A curved wooden water trough on crossed trestle legs, filled with dark green water." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>water-trough</h1>
     <p>A procedural watertight water trough through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom water-trough render">
-      <img src="../assets/water-trough-hero.webp" alt="water-trough render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A curved wooden water trough on crossed trestle legs, filled with dark green water.">
+      <img src="../assets/water-trough-hero.webp" alt="A curved wooden water trough on crossed trestle legs, filled with dark green water." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 3700 tris, three materials with 1674 wood, 156 metal and 29 water faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.093×0.552×0.504 m, zmin 0, four shoes planted, U end-cap rim span 5 mm, strap BVH gap 0, water-hull gap 2.6 mm, hull 1.045×0.466 m, LOD ratios in band, convex collider 64 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --box-ends 17; --float-strap 18; --narrow-hull 19.</div>
@@ -1583,7 +1583,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/water-trough-hero.webp" alt="water-trough render, full size" />
+    <img src="../assets/water-trough-hero.webp" alt="A curved wooden water trough on crossed trestle legs, filled with dark green water." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wave-displace/index.html b/docs/gallery/wave-displace/index.html
index 29c58bf3..f00a565e 100644
--- a/docs/gallery/wave-displace/index.html
+++ b/docs/gallery/wave-displace/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wave-displace-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wave-displace: the example&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A blue grid surface displaced into rolling sine-wave hills." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wave-displace — Examples — Blender Developer Tools" />
   <meta name="twitter:description" content="Bulk vertex IO at real scale — 9,409 vertices displaced into a standing wave with one foreach_get and one foreach_set, no per-vertex access." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wave-displace-hero.webp" />
-  <meta name="twitter:image:alt" content="wave-displace: the example&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A blue grid surface displaced into rolling sine-wave hills." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wave-displace</h1>
     <p>Bulk vertex IO at real scale — 9,409 vertices displaced into a standing wave with one foreach_get and one foreach_set, no per-vertex access.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wave-displace render">
-      <img src="../assets/wave-displace-hero.webp" alt="wave-displace render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A blue grid surface displaced into rolling sine-wave hills.">
+      <img src="../assets/wave-displace-hero.webp" alt="A blue grid surface displaced into rolling sine-wave hills." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the example itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> The bulk path is correct, not just fast: the Z span matches the wave amplitude and every vertex matches the closed-form wave, so a stride bug in the flat buffer cannot hide.</div>
@@ -469,7 +469,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wave-displace-hero.webp" alt="wave-displace render, full size" />
+    <img src="../assets/wave-displace-hero.webp" alt="A blue grid surface displaced into rolling sine-wave hills." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wheelbarrow/index.html b/docs/gallery/wheelbarrow/index.html
index 7a56848b..e39a61a1 100644
--- a/docs/gallery/wheelbarrow/index.html
+++ b/docs/gallery/wheelbarrow/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wheelbarrow-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wheelbarrow: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden wheelbarrow with a box tray, spoked front wheel and two long handles." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wheelbarrow — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural wooden wheelbarrow through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wheelbarrow-hero.webp" />
-  <meta name="twitter:image:alt" content="wheelbarrow: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden wheelbarrow with a box tray, spoked front wheel and two long handles." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wheelbarrow</h1>
     <p>A procedural wooden wheelbarrow through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wheelbarrow render">
-      <img src="../assets/wheelbarrow-hero.webp" alt="wheelbarrow render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden wheelbarrow with a box tray, spoked front wheel and two long handles.">
+      <img src="../assets/wheelbarrow-hero.webp" alt="A wooden wheelbarrow with a box tray, spoked front wheel and two long handles." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2500 tris, two materials with 1094 wood and 190 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.556×0.630×0.572 m, zmin 0, hygiene 0, wall-floor seat 12 mm, spoke clearance 40 mm, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 90 tris, non-empty glTF. --skip-decimate exits 9 on LOD1; --stray-vert exits 15 on hygiene; --lift-z / --short-legs exit 16 on grounded; --fat-spokes / --float-walls exit 17 on joint fit; --pipe-rim exits 18 on tread aspect.</div>
@@ -1830,7 +1830,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wheelbarrow-hero.webp" alt="wheelbarrow render, full size" />
+    <img src="../assets/wheelbarrow-hero.webp" alt="A wooden wheelbarrow with a box tray, spoked front wheel and two long handles." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wooden-barrel/index.html b/docs/gallery/wooden-barrel/index.html
index 2d6c094f..da0bb0a4 100644
--- a/docs/gallery/wooden-barrel/index.html
+++ b/docs/gallery/wooden-barrel/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-barrel-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wooden-barrel: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden stave barrel bound by three metal hoops." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wooden-barrel — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural wine-cask with croze-seated heads and chord-lofted hoops through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-barrel-hero.webp" />
-  <meta name="twitter:image:alt" content="wooden-barrel: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden stave barrel bound by three metal hoops." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wooden-barrel</h1>
     <p>A procedural wine-cask with croze-seated heads and chord-lofted hoops through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wooden-barrel render">
-      <img src="../assets/wooden-barrel-hero.webp" alt="wooden-barrel render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden stave barrel bound by three metal hoops.">
+      <img src="../assets/wooden-barrel-hero.webp" alt="A wooden stave barrel bound by three metal hoops." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 7216 tris, two materials with 2512 wood and 1440 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.722×0.714×0.880 m, 20 grounded staves, hoop bite 0.003 m, head-croze gap 0.007 m, LOD ratios in band, convex collider 238 tris, non-empty glTF. --skip-decimate exits 9; --round-band exits 18 on the hoop-seat budget.</div>
@@ -1515,7 +1515,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wooden-barrel-hero.webp" alt="wooden-barrel render, full size" />
+    <img src="../assets/wooden-barrel-hero.webp" alt="A wooden stave barrel bound by three metal hoops." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wooden-bucket/index.html b/docs/gallery/wooden-bucket/index.html
index 07e37512..1456caf9 100644
--- a/docs/gallery/wooden-bucket/index.html
+++ b/docs/gallery/wooden-bucket/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-bucket-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wooden-bucket: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden stave bucket with metal hoops and a curved wooden bail handle." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wooden-bucket — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural coopered pail with a croze-seated floor, chord-lofted hoops, and a round bail through the ear rings through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-bucket-hero.webp" />
-  <meta name="twitter:image:alt" content="wooden-bucket: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden stave bucket with metal hoops and a curved wooden bail handle." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wooden-bucket</h1>
     <p>A procedural coopered pail with a croze-seated floor, chord-lofted hoops, and a round bail through the ear rings through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wooden-bucket render">
-      <img src="../assets/wooden-bucket-hero.webp" alt="wooden-bucket render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden stave bucket with metal hoops and a curved wooden bail handle.">
+      <img src="../assets/wooden-bucket-hero.webp" alt="A wooden stave bucket with metal hoops and a curved wooden bail handle." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 4872 tris, three materials with 1424 wood, 1020 metal, and 208 rope faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.383×0.346×0.527 m, 16 grounded staves, hoop bite 0.0025 m, bail-ear gap 0.0013 m, LOD ratios in band, convex collider 302 tris, non-empty glTF. --skip-decimate exits 9; --float-handle exits 17 on the bail-ear budget.</div>
@@ -1668,7 +1668,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wooden-bucket-hero.webp" alt="wooden-bucket render, full size" />
+    <img src="../assets/wooden-bucket-hero.webp" alt="A wooden stave bucket with metal hoops and a curved wooden bail handle." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/gallery/wooden-ladder/index.html b/docs/gallery/wooden-ladder/index.html
index c45dd490..7b998689 100644
--- a/docs/gallery/wooden-ladder/index.html
+++ b/docs/gallery/wooden-ladder/index.html
@@ -16,13 +16,13 @@
   <meta property="og:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-ladder-hero.webp" />
   <meta property="og:image:width" content="1280" />
   <meta property="og:image:height" content="720" />
-  <meta property="og:image:alt" content="wooden-ladder: the showcase piece&#x27;s own headless render" />
+  <meta property="og:image:alt" content="A wooden ladder with tapered stiles and round rungs, leaning at an angle." />
   <meta property="og:site_name" content="Blender Developer Tools" />
   <meta name="twitter:card" content="summary_large_image" />
   <meta name="twitter:title" content="wooden-ladder — Showcase — Blender Developer Tools" />
   <meta name="twitter:description" content="A procedural timber ladder with raked tapered stiles, six turned rungs, ferrule caps, and level shoe plates through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract." />
   <meta name="twitter:image" content="https://tmhsdigital.github.io/Blender-Developer-Tools/gallery/assets/wooden-ladder-hero.webp" />
-  <meta name="twitter:image:alt" content="wooden-ladder: the showcase piece&#x27;s own headless render" />
+  <meta name="twitter:image:alt" content="A wooden ladder with tapered stiles and round rungs, leaning at an angle." />
   <style>
     /* fonts are deployed by the landing build (docs/fonts/) */
     @font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap;
@@ -268,8 +268,8 @@ <h1>wooden-ladder</h1>
     <p>A procedural timber ladder with raked tapered stiles, six turned rungs, ferrule caps, and level shoe plates through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom wooden-ladder render">
-      <img src="../assets/wooden-ladder-hero.webp" alt="wooden-ladder render" width="1280" height="720" />
+    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A wooden ladder with tapered stiles and round rungs, leaning at an angle.">
+      <img src="../assets/wooden-ladder-hero.webp" alt="A wooden ladder with tapered stiles and round rungs, leaning at an angle." width="1280" height="720" />
     </button>
     <p class="zoom-hint">Rendered headless by the showcase piece itself — click to zoom.</p>
     <div class="callout"><span class="tag">witnesses</span> Recomputed: 2536 tris, two materials with 612 wood and 736 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.490×0.376×1.487 m, zmin 0, hygiene and coplanar pairs 0, tenon clearance 8 mm, shoe bite 20 mm, LOD ratios in band, convex collider 24 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert and --twin-sole exit 15; --lift-z exits 16; --fat-rungs exits 17; --short-stile exits 18.</div>
@@ -1706,7 +1706,7 @@ <h2>Source</h2>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>
-    <img src="../assets/wooden-ladder-hero.webp" alt="wooden-ladder render, full size" />
+    <img src="../assets/wooden-ladder-hero.webp" alt="A wooden ladder with tapered stiles and round rungs, leaning at an angle." />
   </dialog>
   <footer>
     <div class="statusbar">
diff --git a/docs/new-example-prompt.md b/docs/new-example-prompt.md
index 7f961c7c..a9b715ee 100644
--- a/docs/new-example-prompt.md
+++ b/docs/new-example-prompt.md
@@ -102,8 +102,11 @@ the plugin manifest, the smoke catalog row, and its README, and nothing else. Af
 character—not only `examples/gallery.json` source fields. Open
 `docs/gallery/index.html` and `docs/gallery/<name>/index.html` and inspect the
 rendered `<img alt>` text and the witnesses callout for duplicated words,
-truncation, and generator artifacts (the previous `teaches.split(".")[0]` bug
-truncated alts at dotted API paths like `bmesh.ops`; source JSON looked fine). Keep
+truncation, and generator artifacts. The alt comes from the entry's `alt` field:
+one sentence describing what the still shows, not what the API teaches; the
+generator fails on a missing one (#213). Precedent for reading the output: the
+old `teaches.split(".")[0]` bug truncated alts at dotted API paths like
+`bmesh.ops` while the source JSON looked fine. Keep
 the ROADMAP candidate pool in sync: remove the shipped subject, and add any
 promising subjects you identified but did not build. Do not hand-edit release-owned
 version fields or generated pages; use the repository's generator.
diff --git a/examples/gallery.json b/examples/gallery.json
index 2fb69827..02bd5637 100644
--- a/examples/gallery.json
+++ b/examples/gallery.json
@@ -9,6 +9,7 @@
       "name": "swatch-grid",
       "dir": "examples/swatch-grid",
       "teaches": "Procedural Principled materials — metal and dielectric, the emission pattern, and the cross-version set_specular shim.",
+      "alt": "Six material spheres in two rows: black glossy, copper metal, red, blue, flat orange emission and white.",
       "witnessesFix": "EEVEE engine-id mapping: BLENDER_EEVEE on 5.x, BLENDER_EEVEE_NEXT on 4.2–4.5.",
       "hero": "docs/gallery/assets/swatch-grid-hero.webp",
       "preview": "examples/swatch-grid/preview.webp",
@@ -21,6 +22,7 @@
       "name": "turntable",
       "dir": "examples/turntable",
       "teaches": "A slotted-actions Z-rotation turntable keyed through the cross-version channelbag path (get_channelbag_for_slot).",
+      "alt": "A bronze monkey head (Suzanne) turned three-quarters on a dark studio floor.",
       "witnessesFix": "Slotted-actions boundary: ensure-helper channelbag on 5.x, strip.channelbag on 4.4/4.5.",
       "hero": "docs/gallery/assets/turntable-hero.webp",
       "preview": "examples/turntable/preview.webp",
@@ -32,6 +34,7 @@
       "name": "gn-sdf-remesh",
       "dir": "examples/gn-sdf-remesh",
       "teaches": "A Geometry Nodes SDF remesh (MeshToSDFGrid → GridToMesh at the SDF zero-level), with a Set Material node carrying the material through the remesh.",
+      "alt": "A glossy red torus with visibly blocky voxel faceting from the SDF remesh.",
       "witnessesFix": "An SDF grid is meshed with Grid to Mesh, not Volume to Mesh; GN geometry needs Set Material or it renders untextured.",
       "hero": "docs/gallery/assets/gn-sdf-remesh-hero.webp",
       "preview": "examples/gn-sdf-remesh/preview.webp",
@@ -44,6 +47,7 @@
       "name": "depsgraph-export",
       "dir": "examples/depsgraph-export",
       "teaches": "The depsgraph lifetime contract — evaluated_get().to_mesh() paired with to_mesh_clear() — measured against an OBJ export of the same object.",
+      "alt": "A teal cube beside a slightly faceted teal sphere on a dark studio floor.",
       "witnessesFix": "Exports ship evaluated geometry: the exported vertex count equals the subsurf-applied count and is strictly greater than the base mesh.",
       "hero": "docs/gallery/assets/depsgraph-export-hero.webp",
       "preview": "examples/depsgraph-export/preview.webp",
@@ -56,6 +60,7 @@
       "name": "wave-displace",
       "dir": "examples/wave-displace",
       "teaches": "Bulk vertex IO at real scale — 9,409 vertices displaced into a standing wave with one foreach_get and one foreach_set, no per-vertex access.",
+      "alt": "A blue grid surface displaced into rolling sine-wave hills.",
       "witnessesFix": "The bulk path is correct, not just fast: the Z span matches the wave amplitude and every vertex matches the closed-form wave, so a stride bug in the flat buffer cannot hide.",
       "hero": "docs/gallery/assets/wave-displace-hero.webp",
       "preview": "examples/wave-displace/preview.webp",
@@ -68,6 +73,7 @@
       "name": "driver-wave",
       "dir": "examples/driver-wave",
       "teaches": "A driver_namespace function driving sixteen column heights through SCRIPTED drivers — the sine skyline is entirely driver-evaluated.",
+      "alt": "A row of orange bars whose heights rise and fall in a wave, low in the middle and tall at both ends.",
       "witnessesFix": "Driven values appear after a view-layer update in two places that must agree: the evaluated copy and the original datablock the animation system flushes for display.",
       "hero": "docs/gallery/assets/driver-wave-hero.webp",
       "preview": "examples/driver-wave/preview.webp",
@@ -80,6 +86,7 @@
       "name": "bmesh-gear",
       "dir": "examples/bmesh-gear",
       "teaches": "A 14-tooth gear built entirely with bmesh — profile ring, face, extrude — with bm.free() in a try/finally, exactly as the ownership contract demands.",
+      "alt": "A gold fourteen-tooth gear lying at an angle, its face covered in concentric grooves.",
       "witnessesFix": "Parametric bmesh topology is exactly predictable: verts, edges, and faces match their closed forms, and every edge borders exactly two faces (watertight).",
       "hero": "docs/gallery/assets/bmesh-gear-hero.webp",
       "preview": "examples/bmesh-gear/preview.webp",
@@ -93,6 +100,7 @@
       "name": "shader-node-group",
       "dir": "examples/shader-node-group",
       "teaches": "One reusable shader group declared via tree.interface.new_socket, instanced in two materials with different Tint values — two spheres, one group, two colors.",
+      "alt": "Two glossy spheres, one teal and one magenta, sharing one shader group.",
       "witnessesFix": "Grouping contract: interface sockets appear on every instance, both materials share one group datablock (users == 2), and per-material parameters live on the group node, not inside the tree.",
       "hero": "docs/gallery/assets/shader-node-group-hero.webp",
       "preview": "examples/shader-node-group/preview.webp",
@@ -105,6 +113,7 @@
       "name": "temp-override-join",
       "dir": "examples/temp-override-join",
       "teaches": "Join three unit cubes into a staircase under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form.",
+      "alt": "Three orange cubes joined into a single diagonal staircase object.",
       "witnessesFix": "temp_override actually applies: join consumes the sources, exactly one mesh remains, topology is verts = 8 × steps, and local Z spans all three steps.",
       "hero": "docs/gallery/assets/temp-override-join-hero.webp",
       "preview": "examples/temp-override-join/preview.webp",
@@ -117,6 +126,7 @@
       "name": "gn-instance-grid",
       "dir": "examples/gn-instance-grid",
       "teaches": "A generative Geometry Nodes tree — Mesh Grid → Instance on Points → Realize Instances → Set Shade Smooth — attached as a NODES modifier with no Group Input geometry.",
+      "alt": "A three-by-three grid of green instanced cubes on a dark floor.",
       "witnessesFix": "Realized instances produce closed-form topology (72 verts, 54 faces), Set Material carries Lime, and the corner instance center sits at its closed-form grid coordinate.",
       "hero": "docs/gallery/assets/gn-instance-grid-hero.webp",
       "preview": "examples/gn-instance-grid/preview.webp",
@@ -129,6 +139,7 @@
       "name": "gn-modifier-inputs",
       "dir": "examples/gn-modifier-inputs",
       "teaches": "Per-modifier Geometry Nodes Float inputs on a shared tree — 4.5/5.1 write mod[identifier], 5.2 writes mod.properties.inputs.Socket_1.value.",
+      "alt": "Three boxes stepping up in size from a small teal cube to an orange block to a large red block.",
       "witnessesFix": "The 5.1 dict form raises TypeError on 5.2 rather than silently no-opping; RNA properties are AttributeError on 4.5. Readback and evaluated Z-extent match written scales 1/2/3.",
       "hero": "docs/gallery/assets/gn-modifier-inputs-hero.webp",
       "preview": "examples/gn-modifier-inputs/preview.webp",
@@ -141,6 +152,7 @@
       "name": "shape-key-blend",
       "dir": "examples/shape-key-blend",
       "teaches": "A relative Tall shape key that lifts and flares the top face — authored via shape_key_add / key_blocks / .value — read back from the depsgraph-evaluated mesh.",
+      "alt": "Three purple boxes flaring wider at the top by increasing amounts, from a plain cube to a strong flare.",
       "witnessesFix": "Shape keys do not rewrite mesh.vertices: every evaluated vert matches basis + value × (key − basis), including the flared top half-extent.",
       "hero": "docs/gallery/assets/shape-key-blend-hero.webp",
       "preview": "examples/shape-key-blend/preview.webp",
@@ -153,6 +165,7 @@
       "name": "curve-bevel-arc",
       "dir": "examples/curve-bevel-arc",
       "teaches": "A beveled Bezier semicircle authored on bpy.types.Curve — splines.new('BEZIER'), bezier_points, bevel_depth, use_fill_caps — so the curve renders as a solid tube without a prior mesh conversion.",
+      "alt": "A magenta beveled curve tube sweeping in an arc across a dark floor, with a capped end.",
       "witnessesFix": "Curve tubes are curve datablocks: eight Bezier points, bevel_depth == 0.15, filled caps, and the evaluated mesh has deterministic topology (1044 verts, 1028 faces) resting on the floor.",
       "hero": "docs/gallery/assets/curve-bevel-arc-hero.webp",
       "preview": "examples/curve-bevel-arc/preview.webp",
@@ -165,6 +178,7 @@
       "name": "compositor-glare",
       "dir": "examples/compositor-glare",
       "teaches": "Bloom where it actually lives — a compositor Glare (Fog Glow) node fed by Render Layers, wired via scene.compositing_node_group on 5.x and scene.node_tree on 4.x, with the Glare node's legacy properties vs 5.x menu sockets.",
+      "alt": "Three glowing neon rings, violet, cyan and warm white, with fog-glow bloom and reflections on the floor.",
       "witnessesFix": "scene.node_tree is gone in 5.x and EEVEE has no use_bloom on either side: the halo beyond the ring silhouette falls off strictly with the compositor on and is exactly zero with it off.",
       "hero": "docs/gallery/assets/compositor-glare-hero.webp",
       "preview": "examples/compositor-glare/preview.webp",
@@ -177,6 +191,7 @@
       "name": "damped-track-aim",
       "dir": "examples/damped-track-aim",
       "teaches": "Aim constraints via the data API — Object.constraints.new('DAMPED_TRACK') with target and TRACK_Z, not bpy.ops.object.constraint_add in a headless loop. Gallery still: brass spike cage around an ember core.",
+      "alt": "Gold spikes arranged around a glowing sphere, every tip aimed at the sphere.",
       "witnessesFix": "Every needle has one unmuted DAMPED_TRACK on the core; evaluated local +Z aligns toward the core (dot ≥ 0.998). TRACK_TO stand-ins and flipped axes fail.",
       "hero": "docs/gallery/assets/damped-track-aim-hero.webp",
       "preview": "examples/damped-track-aim/preview.webp",
@@ -190,6 +205,7 @@
       "name": "color-attribute-wheel",
       "dir": "examples/color-attribute-wheel",
       "teaches": "The modern color-attributes API — mesh.color_attributes.new() on the CORNER domain, filled by expanding per-vertex HSV across face corners with foreach_get/foreach_set, then wired into a shader Attribute node.",
+      "alt": "A disc painted with a full hue wheel that fades to white at the centre.",
       "witnessesFix": "CORNER-domain attributes are sized to loop count, not vertex count; the check asserts the sizing, that active_color points at it, and that the Attribute node is actually linked to Base Color, not just present.",
       "hero": "docs/gallery/assets/color-attribute-wheel-hero.webp",
       "preview": "examples/color-attribute-wheel/preview.webp",
@@ -203,6 +219,7 @@
       "name": "parent-inverse-orrery",
       "dir": "examples/parent-inverse-orrery",
       "teaches": "Data-API parenting for a brass orrery — the keep-world idiom (child.parent = pivot; child.matrix_parent_inverse = pivot.matrix_world.inverted()) carrying arms, planets, and a two-level moon through spinning pivots.",
+      "alt": "A brass orrery: a pale central sun on a stand with three planets on arms and orbit rings.",
       "witnessesFix": "Bare `.parent =` really does teleport the child; the idiom restores world position exactly; matrix_world stays stale until view_layer.update(); every orbit lands on its closed form.",
       "hero": "docs/gallery/assets/parent-inverse-orrery-hero.webp",
       "preview": "examples/parent-inverse-orrery/preview.webp",
@@ -215,6 +232,7 @@
       "name": "grease-pencil-rosette",
       "dir": "examples/grease-pencil-rosette",
       "teaches": "Grease Pencil v3's attribute-based API — layer → frames.new(1).drawing → add_strokes → per-point position/radius/opacity/vertex_color — drawing five nested neon rose curves.",
+      "alt": "A neon Grease Pencil rosette of nested cyan, violet, magenta and red petal loops on a dark blue backdrop.",
       "witnessesFix": "The GPv3 address break: 4.5 keeps GPv3 at grease_pencils_v3 while grease_pencils is still legacy GPencil (frame.strokes, no .drawing); 5.x deletes legacy and GPv3 takes over the grease_pencils name. Point writes lazily materialize attribute layers, and every position round-trips through the raw POINT buffer.",
       "hero": "docs/gallery/assets/grease-pencil-rosette-hero.webp",
       "preview": "examples/grease-pencil-rosette/preview.webp",
@@ -227,6 +245,7 @@
       "name": "armature-bend",
       "dir": "examples/armature-bend",
       "teaches": "Rigging end to end in the data API — edit_bones chain construction, name-bound vertex groups with smoothstep blend zones, posing, and depsgraph evaluation — bending a tapered tube through rest, half, and full curl.",
+      "alt": "Three tapered tubes, coral to amber to teal, standing straight, half curled and fully curled by an armature.",
       "witnessesFix": "edit_bones exists only in edit mode (empty in object mode), vertex groups bind to bones strictly by name, and the armature modifier is exactly linear blend skinning: every evaluated vertex must equal Σ wᵢ·(pose_bone.matrix @ bone.matrix_local.inverted()) @ rest, root ring pinned, tip deflected — a straight tube fails.",
       "hero": "docs/gallery/assets/armature-bend-hero.webp",
       "preview": "examples/armature-bend/preview.webp",
@@ -240,6 +259,7 @@
       "name": "text-version-stamp",
       "dir": "examples/text-version-stamp",
       "teaches": "The TextCurve data API — curves.new(type='FONT'), live body text from bpy.app.version_string, extrude and bevel_depth solids, and evaluated-mesh conversion — so every render self-documents which Blender produced it.",
+      "alt": "The word BLENDER above the Blender version number in large gold 3D characters.",
       "witnessesFix": "TextCurve solids are exactly predictable: evaluated z-extent = 2 × (extrude + bevel_depth), bevel widens the outline by 2 × bevel_depth, editing body regenerates geometry — and version_string is not bare semver on LTS (\"4.5.11 LTS\"), so parse bpy.app.version instead.",
       "hero": "docs/gallery/assets/text-version-stamp-hero.webp",
       "preview": "examples/text-version-stamp/preview.webp",
@@ -253,6 +273,7 @@
       "name": "image-pixels-testcard",
       "dir": "examples/image-pixels-testcard",
       "teaches": "The Image pixel-buffer contract — a procedural broadcast test card written into bpy.data.images.new() with one pixels.foreach_set (589,824 floats), byte vs float_buffer storage, scale() reallocation, and the save() vs save_render() lifecycle.",
+      "alt": "A monitor showing a colour-bar test card with a black circle and a greyscale strip.",
       "witnessesFix": "pixels is always flat RGBA (channels == 4 even with alpha=False), byte storage quantizes at exactly ≤ 0.5/255 and strictly > 0, stale-size bulk reads raise after scale() — and save() silently flips source to FILE and drops the buffer, so later pixels reads come from whatever sits on disk (proven with an imposter file).",
       "hero": "docs/gallery/assets/image-pixels-testcard-hero.webp",
       "preview": "examples/image-pixels-testcard/preview.webp",
@@ -266,6 +287,7 @@
       "name": "png-exr-alpha",
       "dir": "examples/png-exr-alpha",
       "teaches": "Float-image PNG save trap — float_buffer=True Image.save() writes RGBA16 and unpremultiplies as if associated-alpha, clamping straight-authored dark values at low alpha to white (closed-form err 0.98 at RGB 0.02 / a=1/255).",
+      "alt": "Two monitors on a plinth labelled FLOAT to PNG and FLOAT to EXR, showing alpha and colour bar strips side by side.",
       "witnessesFix": "float→PNG IHDR is RGBA16 and matches q16(min(1, c/q16(a))); OpenEXR round-trips within 1e-5; byte→PNG is straight RGBA8; EXR color_mode=RGB drops alpha to opaque.",
       "hero": "docs/gallery/assets/png-exr-alpha-hero.webp",
       "preview": "examples/png-exr-alpha/preview.webp",
@@ -279,6 +301,7 @@
       "name": "uv-layer-grid",
       "dir": "examples/uv-layer-grid",
       "teaches": "The UV-layer authoring hazard — bmesh.ops.create_grid(..., calc_uvs=True) is a silent no-op unless a UV layer already exists; without one an Image Texture samples texel (0,0) everywhere.",
+      "alt": "Two lightbox panels: the left one flat teal with no UV layer, the right one a full magenta, cyan and green checker.",
       "witnessesFix": "calc_uvs=True alone leaves 0 UV layers; pre-create + calc_uvs fills loops to the closed-form grid UVs ((x/size+1)/2, (y/size+1)/2) within 1e-6; explicit loop assignment is the calc_uvs-free fallback. The still is self-witnessing: the script re-reads its render and exits non-zero unless the hazard panel is one flat teal and the repaired panel a high-contrast checker.",
       "hero": "docs/gallery/assets/uv-layer-grid-hero.webp",
       "preview": "examples/uv-layer-grid/preview.webp",
@@ -293,6 +316,7 @@
       "name": "vse-cut-list",
       "dir": "examples/vse-cut-list",
       "teaches": "The sequencer API rename from 4.5 LTS to 5.x — strips (never .sequences), new_effect ending in length= vs frame_end=, and left_handle/right_handle/duration replacing the deprecated frame_final_*. A deterministic cut list — color programs, a clamped GAMMA_CROSS, a scene strip, a text strip — asserted before and after save/reload.",
+      "alt": "A monitor on a plinth showing a sequencer frame of four colour blocks with a cut-list caption strip.",
       "witnessesFix": "Each side hard-fails the other's spelling: TypeError on the wrong end kwarg, AttributeError on .sequences. The cross clamps to the source overlap, effect strips consume their inputs only when stacked above them, and a same-scene scene strip renders transparent.",
       "hero": "docs/gallery/assets/vse-cut-list-hero.webp",
       "preview": "examples/vse-cut-list/preview.webp",
@@ -305,6 +329,7 @@
       "name": "gltf-export-roundtrip",
       "dir": "examples/gltf-export-roundtrip",
       "teaches": "A sci-fi supply crate exported to glTF and re-imported, verifying the round-trip against the depsgraph-evaluated mesh within float tolerances. Positions, loop normals, box-mapped UVs, and per-triangle material bindings must all survive; the on-disk JSON proves the +Y-up conversion and the V-flipped UV layout.",
+      "alt": "Two identical olive equipment crates with cyan light strips, labelled AUTHORED and ROUND-TRIP.",
       "witnessesFix": "export_yup bakes (x, y, z) -> (x, z, -y) into the vertex data with no node rotation (probed identical on 4.5.11 and 5.1.2); export_apply ships the evaluated mesh, not the base cage; exporter/importer RNA is guarded so a future kwarg rename fails loudly.",
       "hero": "docs/gallery/assets/gltf-export-roundtrip-hero.webp",
       "preview": "examples/gltf-export-roundtrip/preview.webp",
@@ -317,6 +342,7 @@
       "name": "export-preset-axis",
       "dir": "examples/export-preset-axis",
       "teaches": "A radio beacon exported under Unity and Godot glTF presets and re-imported, proving the two files have different vertex orientation",
+      "alt": "Two copies of a lamp-post beacon: the left one standing upright, the right one lying on its side.",
       "witnessesFix": "Unity export_yup=True round-trips standing (x,y,z); Godot export_yup=False reimports lying along -Y as (x,-z,y); --same-axis exits 9; exporter RNA is guarded so a future kwarg rename fails loudly",
       "hero": "docs/gallery/assets/export-preset-axis-hero.webp",
       "preview": "examples/export-preset-axis/preview.webp",
@@ -328,6 +354,7 @@
       "name": "lod-decimate-chain",
       "dir": "examples/lod-decimate-chain",
       "teaches": "A retro rocket at LOD0/1/2 via the Decimate modifier evaluated through the depsgraph. The check proves the reduction is non-destructive, the triangle count hits ratio x base within bounds, and silhouette-critical dimensions survive.",
+      "alt": "Three red and white rockets labelled LOD0, LOD1 and LOD2, each more coarsely faceted than the last.",
       "witnessesFix": "Evaluated-vs-original: the depsgraph carries the reduction while obj.data keeps the closed-form counts. A stacked Decimate halves the effective ratio (caught); an aggressive ratio collapses the nose tip (caught).",
       "hero": "docs/gallery/assets/lod-decimate-chain-hero.webp",
       "preview": "examples/lod-decimate-chain/preview.webp",
@@ -340,6 +367,7 @@
       "name": "vertex-weight-limit",
       "dir": "examples/vertex-weight-limit",
       "teaches": "A rigged mech arm pruned to the game-engine cap of four bone influences per vertex, through the data API. The check proves no vertex exceeds the cap, weights still sum to one, the pose survives pruning, and the modifier is still exact linear blend skinning.",
+      "alt": "A segmented orange robotic arm on a round base, bent at the elbow, with teal bands at the joints.",
       "witnessesFix": "Limit-total and normalize without bpy.ops: keep the top four groups, VertexGroup.remove the rest, renormalize. LBS is verified against the weights read back from the mesh's own deform layer, not the authoring function.",
       "hero": "docs/gallery/assets/vertex-weight-limit-hero.webp",
       "preview": "examples/vertex-weight-limit/preview.webp",
@@ -352,6 +380,7 @@
       "name": "triangulate-tangents",
       "dir": "examples/triangulate-tangents",
       "teaches": "A machined buckler verifying the tangent-space contract a game engine's normal mapping depends on. Deterministic triangulation, unit orthogonal tangent frames, and the edge/UV-delta formula matching mikktspace within welding tolerance.",
+      "alt": "A round silver buckler on a stand, its face brushed in circular grooves with an anisotropic highlight.",
       "witnessesFix": "calc_tangents aborts on any ngon; planar UVs on a cylindrical wall collapse tangents onto normals; a MeshUVLoopLayer handle held across calc_tangents dangles on 4.5 (471 phantom flips, silent exit 0) while the mikktspace math is byte-identical on both versions.",
       "hero": "docs/gallery/assets/triangulate-tangents-hero.webp",
       "preview": "examples/triangulate-tangents/preview.webp",
@@ -364,6 +393,7 @@
       "name": "gltf-skin-roundtrip",
       "dir": "examples/gltf-skin-roundtrip",
       "teaches": "A rigged mech scorpion exported to glTF with skins and re-imported, verifying the skinning contract the geometry round-trip left uncovered. Skeleton, weights, and deformation must all survive the format.",
+      "alt": "Two blocky orange scorpion robots with curled tails and glowing cyan stingers, authored and re-imported.",
       "witnessesFix": "skins[0].joints names every bone; JOINTS_0/WEIGHTS_0 per primitive with unit sums; weights bit-exact on re-import; deformation matches within 4.8e-07. The mesh must be parented to the armature or the exporter binds by name.",
       "hero": "docs/gallery/assets/gltf-skin-roundtrip-hero.webp",
       "preview": "examples/gltf-skin-roundtrip/preview.webp",
@@ -376,6 +406,7 @@
       "name": "vse-gamma-cross",
       "dir": "examples/vse-gamma-cross",
       "teaches": "The GAMMA_CROSS fade is not the naive linear mix: it blends in a gamma-0.5 space, so the mid-cross dips below the sRGB lerp. Tiny per-frame renders are asserted against the closed form per frame.",
+      "alt": "A steel swatch board with a row of four fade chips from pink to cyan, and below it two mid-grey chips compared, one framed in orange.",
       "witnessesFix": "out = ((1-t)*sqrt(A) + t*sqrt(B))^2 with t = (frame - start) / duration, never 1 inside the effect. The mid lerp deviation is 0.115; AgX-default sampling poisons the fit (Standard is mandatory).",
       "hero": "docs/gallery/assets/vse-gamma-cross-hero.webp",
       "preview": "examples/vse-gamma-cross/preview.webp",
@@ -388,6 +419,7 @@
       "name": "light-link-studio",
       "dir": "examples/light-link-studio",
       "teaches": "One key, one hero: a light linked to a receiver collection lights only the hero, proven by two pixel renders in one pass. Linked: 3.6x luminance ratio; unlinked in the same check: the decoy rises 233% while the hero holds at 0.3% drift.",
+      "alt": "Two spheres on pedestals: a brightly lit orange sphere labelled LINKED and a dark grey sphere labelled UNLINKED.",
       "witnessesFix": "The API is obj.light_linking on the light OBJECT (ld.light_linking is an AttributeError). Luminance is sampled at each sphere's projected center; EEVEE honors linking too (probe-measured 3.8x on 4.5.11 EEVEE Next and 5.1.2 EEVEE), Cycles pinned for deterministic samples.",
       "hero": "docs/gallery/assets/light-link-studio-hero.webp",
       "preview": "examples/light-link-studio/preview.webp",
@@ -401,6 +433,7 @@
       "name": "collision-hull-proxy",
       "dir": "examples/collision-hull-proxy",
       "teaches": "A fire hydrant street prop inside its compound collision shell: four convex pieces hulled by bmesh.ops.convex_hull from a coarse inflated cage. The dense render mesh is never hulled - its hull would measure 380 faces, over the 255-face per-piece engine budget. Closed-form plane tests prove containment, convexity, watertightness, outward winding, and Euler characteristic 2 per piece.",
+      "alt": "A red and yellow fire hydrant wrapped in a cyan wireframe convex collision hull.",
       "witnessesFix": "A hull of the dense render mesh measures 380 faces, over the 255-face per-piece budget - the cage is a coarser lathe with rings inflated by sec(pi/n) so each cage ring circumscribes its render ring exactly (containment 4.4e-08). Proud details cost cage rows; concave grooves are free under the hull. Piece budgets: body 70, caps 60+60+60, compound 250.",
       "hero": "docs/gallery/assets/collision-hull-proxy-hero.webp",
       "preview": "examples/collision-hull-proxy/preview.webp",
@@ -414,6 +447,7 @@
       "name": "custom-normals-shade",
       "dir": "examples/custom-normals-shade",
       "teaches": "A jerry can prop shaded three ways to prove the post-4.1 shading contract: hard edges are mesh data, landing exactly where the dihedral crosses. Face smooth flags plus a sharp_edge attribute, verified against an independently recomputed dihedral test, and per-loop custom normals surviving depsgraph evaluation within their int16 storage quantization (1.407e-04, not float-exact).",
+      "alt": "Three olive jerry cans with embossed X ribs, shaded flat, smooth and smooth-by-angle.",
       "witnessesFix": "use_auto_smooth, use_custom_normals and calc_normals are AttributeError on BOTH 4.5 LTS and 5.1 - AI code still emits them. The legacy shade_auto_smooth operator CANCELS headless on 4.5 (asset load never finishes; mesh untouched; no exception) while 5.1 FINISHES with the Smooth by Angle NODES modifier. By-angle sharp sets match the independent dihedral recompute exactly (188 of 388 edges over 3 meshes).",
       "hero": "docs/gallery/assets/custom-normals-shade-hero.webp",
       "preview": "examples/custom-normals-shade/preview.webp",
@@ -426,6 +460,7 @@
       "name": "sky-texture-sun-elevation",
       "dir": "examples/sky-texture-sun-elevation",
       "teaches": "World ShaderNodeTexSky driving Background Color — the sky contract across 4.5 LTS and 5.1. sky_type is NISHITA on 4.5 and MULTIPLE_SCATTERING on 5.1 (NISHITA gone); dust_density exists only on 4.5 (aerosol_density on 5.1). Two tiny Cycles OPEN_EXR zenith probes prove sun_elevation 8 deg to 55 deg brightens zenith (rise 2.25x on 5.1.2, 1.50x on 4.5.11, gate >= 1.25).",
+      "alt": "Split view of an orange cone under a procedural sky: sun elevation 8 degrees on the left, 55 degrees on the right.",
       "witnessesFix": "AI code still assigns sky_type='NISHITA' and dust_density on 5.1 — both are wrong (NISHITA removed; dust_density is AttributeError; use MULTIPLE_SCATTERING + aerosol_density). A near-black Background Strength alone is not a sky: Sky must link into Background Color. Elevation that does not brighten zenith fails the rise gate.",
       "hero": "docs/gallery/assets/sky-texture-sun-elevation-hero.webp",
       "preview": "examples/sky-texture-sun-elevation/preview.webp",
@@ -439,6 +474,7 @@
       "name": "gp-lineart-contour",
       "dir": "examples/gp-lineart-contour",
       "teaches": "Grease Pencil LINEART modifier contours via the depsgraph on a faceted crystal. source_object is load-bearing (clear yields 0 strokes); contour+crease off yields 0; restore recovers 10 strokes / 34 points on both 4.5.11 and 5.1.2. Stroke width: thickness exists on 4.5, AttributeError on 5.1 — portable path is radius.",
+      "alt": "A translucent hourglass-shaped solid outlined by cyan Line Art contour strokes.",
       "witnessesFix": "AI code still sets LINEART.thickness on 5.1 (AttributeError) or hand-draws strokes / enables Freestyle instead of modifiers.new(..., 'LINEART'). Clearing source_object or leaving contour+crease off silently yields an empty drawing — the check proves both failure modes and recovery.",
       "hero": "docs/gallery/assets/gp-lineart-contour-hero.webp",
       "preview": "examples/gp-lineart-contour/preview.webp",
@@ -452,6 +488,7 @@
       "name": "mesh-hygiene-audit",
       "dir": "examples/mesh-hygiene-audit",
       "teaches": "Engine-ingest mesh hygiene on an octagonal street valve: no ngons, no loose verts, manifold edges, no zero-area faces, positive signed volume, Euler V-E+F==2. Dual-panel still shows a through-hole and loose-vert bead derived from live mesh incidence — same brass on both so color alone cannot carry the proof.",
+      "alt": "Two brass spool-shaped props labelled DIRTY and CLEAN; the dirty one has glowing orange stray edges inside it.",
       "witnessesFix": "Pipelines that skip topology gates ship open boundaries, loose verts, or non-sphere Euler into engine ingest. The still makes the boundary hole and loose vert readable; ngon / zero-area / full winding invert remain check-only.",
       "hero": "docs/gallery/assets/mesh-hygiene-audit-hero.webp",
       "preview": "examples/mesh-hygiene-audit/preview.webp",
@@ -465,6 +502,7 @@
       "name": "prop-origin-transform",
       "dir": "examples/prop-origin-transform",
       "teaches": "Street pedestal origin-to-base-center + data-API scale apply + matrix_parent_inverse for a flanged conduit accessory. After bake: scale (1,1,1), local min.z==0, world AABB unchanged. Bare parent jumps the accessory off an empty mount socket; MPI keeps it seated.",
+      "alt": "Two teal pedestals labelled TRAP and MPI KEEP: on the left a conduit fitting has jumped out of its socket, on the right it sits seated.",
       "witnessesFix": "Bare child.parent = parent teleports accessories off their mounts; skipping view_layer.update() before matrix_world, or leaving non-uniform scale / centered origin, breaks engine ingest placement.",
       "hero": "docs/gallery/assets/prop-origin-transform-hero.webp",
       "preview": "examples/prop-origin-transform/preview.webp",
@@ -478,6 +516,7 @@
       "name": "soccer-ball-goldberg",
       "dir": "examples/soccer-ball-goldberg",
       "teaches": "A soccer ball as a Goldberg polyhedron: a bmesh icosphere truncated at 1/3 per edge, faces ordered by link-topology walks, panels bound by face vertex count.",
+      "alt": "A white soccer ball with black pentagon panels, built as a smoothed Goldberg polyhedron.",
       "witnessesFix": "Goldberg invariants are closed forms — counts, degree 3, uniform edges, planar faces, one circumsphere — and panels bind by vertex count, never enumeration order.",
       "hero": "docs/gallery/assets/soccer-ball-goldberg-hero.webp",
       "preview": "examples/soccer-ball-goldberg/preview.webp",
@@ -491,6 +530,7 @@
       "name": "car-mirror-symmetry",
       "dir": "examples/car-mirror-symmetry",
       "teaches": "A generic hatchback lofted as one half (14 stations, 9-point rings) and completed by the Mirror modifier, evaluated through the depsgraph. Wheels and lamps mirror about object origins parked on the symmetry plane.",
+      "alt": "A red low-poly hatchback with white headlights, modelled as one mirrored half.",
       "witnessesFix": "Mirror is a modifier, not applied data: the original keeps the authored half while the evaluated mesh is the welded, watertight, exactly symmetric whole.",
       "hero": "docs/gallery/assets/car-mirror-symmetry-hero.webp",
       "preview": "examples/car-mirror-symmetry/preview.webp",
@@ -504,6 +544,7 @@
       "name": "attribute-domain-shear",
       "dir": "examples/attribute-domain-shear",
       "teaches": "POINT vs CORNER color-attribute domains on a shared-vertex pinwheel: CORNER stays exact per face while a naive per-wedge POINT loop shears to the last write at the hub. Crisp petals versus a smeared swirl in one frame; the measured shear equals the palette closed form.",
+      "alt": "Two octagonal rainbow-coloured caps labelled CORNER and POINT, last write wins, showing different colour blending.",
       "witnessesFix": "Authoring per-face colors into a POINT-domain attribute overwrites shared vertices once per neighbor; the last write wins and intended colors shear across every shared vertex.",
       "hero": "docs/gallery/assets/attribute-domain-shear-hero.webp",
       "preview": "examples/attribute-domain-shear/preview.webp",
@@ -517,6 +558,7 @@
       "name": "degenerate-bevel-weld",
       "dir": "examples/degenerate-bevel-weld",
       "teaches": "Bevel offset >= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles crossing the export boundary. Dual tray: rounded edge versus knife seam, markers from live mesh data.",
+      "alt": "Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners.",
       "witnessesFix": "At offset == min_dimension/2 the bevel band pinches to exactly 12 zero-area faces (4 edges x 3 segments); 32 degenerate triangles cross into the exported GLB, waiting for any merge-by-distance to weld them.",
       "hero": "docs/gallery/assets/degenerate-bevel-weld-hero.webp",
       "preview": "examples/degenerate-bevel-weld/preview.webp",
@@ -530,6 +572,7 @@
       "name": "modular-kit-snap",
       "dir": "examples/modular-kit-snap",
       "teaches": "A tiling corridor kit whose open-end boundary verts snap to the tile grid, so instances at 4 m multiples join with zero gap or overlap.",
+      "alt": "A sci-fi corridor built from snapped modular segments, with glass wall panels, orange trim rails and a lit doorway at the far end.",
       "witnessesFix": "16 boundary verts on x∈{0,4} within 1e-6 m, linked-duplicate joint deviation 0.0, bbox == declared tile; unsnapped probe fails at 3e-3 m.",
       "hero": "docs/gallery/assets/modular-kit-snap-hero.webp",
       "preview": "examples/modular-kit-snap/preview.webp",
@@ -545,6 +588,7 @@
       "name": "lightmap-uv-channel",
       "dir": "examples/lightmap-uv-channel",
       "teaches": "A market cart carrying the two-channel UV contract for baked lighting: UV0 untouched, UVLight packed with no overlaps and a respected margin.",
+      "alt": "A wooden covered cart beside a board showing its packed lightmap UV atlas as coloured islands.",
       "witnessesFix": "Per-part UVMap/UVLight with active vs active_render pinned (ops clear both flags), UV0 drift 0.0, 3680 islands with 0 SAT overlaps, min island distance 0.00401.",
       "hero": "docs/gallery/assets/lightmap-uv-channel-hero.webp",
       "preview": "examples/lightmap-uv-channel/preview.webp",
@@ -558,6 +602,7 @@
       "name": "socket-attach-points",
       "dir": "examples/socket-attach-points",
       "teaches": "A survey drone whose named SKT_ empties are the spawn contract: modules parented with an identity local transform seat exactly on their mount pads.",
+      "alt": "A dark quadcopter drone with orange motor mounts, propellers and attached antenna and camera parts.",
       "witnessesFix": "7 socket world matrices within 1.788e-07 of the authored transform, socket +Z == the pad's Newell normal (1.794e-07), seating offset 0.0; the no-parent-inverse probe jumps 0.690128 m.",
       "hero": "docs/gallery/assets/socket-attach-points-hero.webp",
       "preview": "examples/socket-attach-points/preview.webp",
@@ -572,6 +617,7 @@
       "name": "vertex-color-ao",
       "dir": "examples/vertex-color-ao",
       "teaches": "A stone well carrying baked ambient occlusion in a colour attribute, with the bake held to the closed-form hemisphere integral rather than to a captured value.",
+      "alt": "A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion.",
       "witnessesFix": "Integrator matches 1 - 0.5(1 - 1/sqrt(1+k^2)) to 6.760e-04, unoccluded plate exactly 1.0, FLOAT_COLOR exact vs BYTE_COLOR sRGB-quantised (model agreement 3.189e-07), evaluated deviation 0.0.",
       "hero": "docs/gallery/assets/vertex-color-ao-hero.webp",
       "preview": "examples/vertex-color-ao/preview.webp",
@@ -586,6 +632,7 @@
       "name": "cross-version-property-delete",
       "dir": "examples/cross-version-property-delete",
       "teaches": "Custom ID properties are removed with del, not property_unset. The IDs are built through bpy.data.objects.new so the check does not depend on active_object.",
+      "alt": "Two framed display panels on a stand: the left shows a lit cyan screen, the right a blank grey one.",
       "witnessesFix": "Factory-empty has no active_object; property_unset raises TypeError and leaves the key; del removes it (clear_has=False). --skip-delete and --unset-instead exit 7.",
       "hero": "docs/gallery/assets/cross-version-property-delete-hero.webp",
       "preview": "examples/cross-version-property-delete/preview.webp",
@@ -598,6 +645,7 @@
       "name": "usd-export-evaluation-mode",
       "dir": "examples/usd-export-evaluation-mode",
       "teaches": "The USD exporter evaluation_mode chooses viewport versus render modifier quality. TESSELLATE makes the split observable; BEST_MATCH writes the cage and the mode is silent.",
+      "alt": "Two grey spheres: a coarse, flat-shaded one on the left and a smooth, subdivided one on the right.",
       "witnessesFix": "TESSELLATE+VIEWPORT writes 26/24; TESSELLATE+RENDER writes 98/96 subdivisionScheme=none; BEST_MATCH writes the 8-vert catmullClark cage. --evaluation-mode VIEWPORT and --subdivision BEST_MATCH exit 4.",
       "hero": "docs/gallery/assets/usd-export-evaluation-mode-hero.webp",
       "preview": "examples/usd-export-evaluation-mode/preview.webp",
@@ -610,6 +658,7 @@
       "name": "gn-zone-iterate",
       "dir": "examples/gn-zone-iterate",
       "teaches": "Repeat Zone and For Each Element only iterate after pair_with_output. Evaluated cube counts follow 8 times (1+N) and 8 times P, not tree structure.",
+      "alt": "Four ochre cubes in a row from a Repeat zone beside a vertical stack of six cyan cubes from a For Each zone.",
       "witnessesFix": "Repeat 32/24 verts/faces with X-centers at k*1.2; For Each 48/36 with Z-centers at i*0.6+0.21. Unpaired evaluates empty; For Each main Geometry passthrough is 6 verts.",
       "hero": "docs/gallery/assets/gn-zone-iterate-hero.webp",
       "preview": "examples/gn-zone-iterate/preview.webp",
@@ -621,6 +670,7 @@
       "name": "bake-normal-high-to-low",
       "dir": "examples/bake-normal-high-to-low",
       "teaches": "A collapse-decimated hatch plate receiving a Cycles cage-baked tangent normal map from a ribbed high-poly source",
+      "alt": "A baked tangent-space normal map shown as a lilac card beside a bronze plate wearing it, with a radial embossed pattern.",
       "witnessesFix": "Statistical gates not byte-identity: detail frac 0.7211 / MAD 0.09356 vs flat 0.0000 / 0.00277; --flat-source exits 5; type=NORMAL not bake_type; RNA identical on 4.5.11, 5.1.2, 5.2.1",
       "hero": "docs/gallery/assets/bake-normal-high-to-low-hero.webp",
       "preview": "examples/bake-normal-high-to-low/preview.webp",
@@ -632,6 +682,7 @@
       "name": "gn-socket-rename",
       "dir": "examples/gn-socket-rename",
       "teaches": "Compare and Random Value socket identifiers collapsed onto reused names in 5.2; enabled-name lookup wires on 4.5, 5.1, and 5.2",
+      "alt": "A copper measuring column with graduated tick marks standing on a grey base plate.",
       "witnessesFix": "A_INT and Min_001 present on 4.5.11 and 5.1.2, absent on 5.2.1. --legacy-ids exits 5 only on 5.2. Evaluated 16 verts and gauge_h 1.80 on eight column verts; the still draws the column graduations from gauge_h, so an unwired Random Value renders a blank column",
       "hero": "docs/gallery/assets/gn-socket-rename-hero.webp",
       "preview": "examples/gn-socket-rename/preview.webp",
diff --git a/scripts/build_gallery.py b/scripts/build_gallery.py
index 521892ac..4cfe1086 100644
--- a/scripts/build_gallery.py
+++ b/scripts/build_gallery.py
@@ -49,8 +49,8 @@
                "ball, gold spikes aimed at a glowing sphere, and two spheres on pedestals "
                "labelled linked and unlinked")
 
-# Soft cap for gallery index card alt text (accessibility + layout).
-_ALT_CAP = 160
+# Upper bound for an entry's ``alt`` (one descriptive sentence, never truncated).
+ALT_MAX = 200
 
 
 def load_gallery_entries() -> tuple[dict, list]:
@@ -79,55 +79,21 @@ def kind_noun(entry: dict) -> str:
     return "showcase piece" if "showcase" in (entry.get("tags") or []) else "example"
 
 
-def first_sentence(text: str) -> str:
-    """First sentence of *text*, splitting on period-followed-by-whitespace.
+def check_alts(entries: list) -> None:
+    """Every entry needs an ``alt``: one sentence saying what its still shows.
 
-    Do not use ``str.split(".")[0]``: bpy teaches strings are full of dotted
-    API paths (``bmesh.ops.create_grid``, ``bpy.context.temp_override``), and
-    that split truncates mid-identifier.
+    Alts used to be derived from ``teaches``, which describes the API, not the
+    picture, and was cut at 160 characters (#213). A description cannot be
+    derived; it has to be written, so a missing one fails the build.
     """
-    m = re.search(r"\.\s+", text)
-    if m:
-        return text[: m.start() + 1].strip()
-    return text.strip()
-
-
-def card_alt(name: str, teaches: str, *, cap: int = _ALT_CAP) -> str:
-    """Gallery card ``<img alt>``: ``{name} — {first sentence}``, length-capped."""
-    first = first_sentence(teaches)
-    if len(first) > cap:
-        cut = first[:cap].rsplit(" ", 1)[0].rstrip(".,;: —-")
-        first = (cut if cut else first[:cap].rstrip()) + "…"
-    return f"{name} — {first}"
-
-
-def assert_alts_survive_dotted_paths(examples: list) -> None:
-    """Fail the build if any card alt is still truncated at the first ``.``.
-
-    Catches regressions of the old ``teaches.split(".")[0]`` bug for every
-    example whose first sentence contains a dotted identifier.
-    """
-    for ex in examples:
-        teaches = ex["teaches"]
-        name = ex["name"]
-        alt = card_alt(name, teaches)
-        first_dot = teaches.find(".")
-        if first_dot < 0:
-            continue
-        # First "." is a real sentence end (EOS or whitespace after it).
-        if first_dot == len(teaches) - 1 or teaches[first_dot + 1].isspace():
-            continue
-        suffix = alt.split(" — ", 1)[-1]
-        if len(suffix) <= first_dot:
-            raise SystemExit(
-                f"gallery alt truncated at dotted API path for {name!r}: {alt!r}"
-            )
-        # Old bug would have produced exactly this string:
-        legacy = f"{name} — {teaches.split('.')[0]}"
-        if alt == legacy:
-            raise SystemExit(
-                f"gallery alt still matches legacy split('.')[0] for {name!r}: {alt!r}"
-            )
+    for e in entries:
+        alt = (e.get("alt") or "").strip()
+        if not alt:
+            raise SystemExit(f"gallery entry {e['name']!r} has no 'alt': add one sentence "
+                             "describing what its still shows")
+        if len(alt) > ALT_MAX:
+            raise SystemExit(f"gallery entry {e['name']!r} alt is {len(alt)} chars "
+                             f"(max {ALT_MAX}); describe the still in one sentence")
 
 # ---------------------------------------------------------------------------
 # Shared page shell. __ROOT__ is the relative prefix from the page to the
@@ -888,8 +854,8 @@ def build_detail(ex: dict, *, base: str, repo_root_url: str, site: str) -> str:
     parts.append(f'    <p>{html.escape(ex["teaches"])}</p>')
     parts.append("  </header>")
     parts.append('  <main id="main">')
-    parts.append(f'    <button class="detail-hero" id="heroZoom" type="button" aria-label="Zoom {html.escape(name)} render">')
-    parts.append(f'      <img src="../assets/{html.escape(hero_file)}" alt="{html.escape(name)} render" width="1280" height="720" />')
+    parts.append(f'    <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: {html.escape(ex["alt"], quote=True)}">')
+    parts.append(f'      <img src="../assets/{html.escape(hero_file)}" alt="{html.escape(ex["alt"], quote=True)}" width="1280" height="720" />')
     parts.append("    </button>")
     parts.append(f'    <p class="zoom-hint">Rendered headless by the {noun} itself — click to zoom.</p>')
     parts.append(f'    <div class="callout"><span class="tag">witnesses</span> {html.escape(ex["witnessesFix"])}</div>')
@@ -922,7 +888,7 @@ def build_detail(ex: dict, *, base: str, repo_root_url: str, site: str) -> str:
     parts.append("  </main>")
     parts.append('  <dialog class="lightbox" id="lightbox" aria-label="Full-size render">')
     parts.append('    <button class="lightbox-close" type="button" autofocus>Close</button>')
-    parts.append(f'    <img src="../assets/{html.escape(hero_file)}" alt="{html.escape(name)} render, full size" />')
+    parts.append(f'    <img src="../assets/{html.escape(hero_file)}" alt="{html.escape(ex["alt"], quote=True)}" />')
     parts.append("  </dialog>")
 
     return shell(
@@ -931,7 +897,7 @@ def build_detail(ex: dict, *, base: str, repo_root_url: str, site: str) -> str:
         canonical=f"{site}/gallery/{name}/" if site else "",
         og_image=f"{site}/gallery/assets/{hero_file}" if site else "",
         og_size=(1280, 720),
-        og_alt=f"{name}: the {noun}'s own headless render",
+        og_alt=ex["alt"],
         site_root="../../",
         back_href="../",
         back_label="Examples and Showcase",
@@ -996,7 +962,7 @@ def build_index(data: dict, *, base: str, repo_root_url: str, site: str) -> str:
 
     cards = []
     for ex in examples:
-        alt = card_alt(ex["name"], ex["teaches"])
+        alt = ex["alt"]
         cards.append(
             CARD
             .replace("__TAGS__", html.escape(" ".join(ex.get("tags", [])), quote=True))
@@ -1064,7 +1030,7 @@ def main() -> int:
             print(f"ERROR: no .py script in {ex['dir']}", file=sys.stderr)
             return 4
 
-    assert_alts_survive_dotted_paths(examples)
+    check_alts(examples)
 
     OUT_DIR.mkdir(parents=True, exist_ok=True)
     (OUT_DIR / "index.html").write_text(
diff --git a/scripts/site/template.html.j2 b/scripts/site/template.html.j2
index 03a13529..f51806f5 100644
--- a/scripts/site/template.html.j2
+++ b/scripts/site/template.html.j2
@@ -322,7 +322,7 @@
       <div class="render-grid">
         {% for ex in shown %}
         <a class="render-card" href="gallery/{{ ex.name }}/">
-          <img src="{{ ex.heroSite }}" alt="{{ ex.name }} render" loading="lazy" width="1280" height="720" />
+          <img src="{{ ex.heroSite }}" alt="{{ ex.alt | default(ex.name ~ ' render', true) }}" loading="lazy" width="1280" height="720" />
           <div class="render-meta">
             <span class="name">{{ ex.name }}</span>
             <span class="teach">{{ ex.teaches }}</span>
@@ -352,7 +352,7 @@
       <div class="render-grid">
         {% for ex in shown_showcase %}
         <a class="render-card" href="gallery/{{ ex.name }}/">
-          <img src="{{ ex.heroSite }}" alt="{{ ex.name }} render" loading="lazy" width="1280" height="720" />
+          <img src="{{ ex.heroSite }}" alt="{{ ex.alt | default(ex.name ~ ' render', true) }}" loading="lazy" width="1280" height="720" />
           <div class="render-meta">
             <span class="name">{{ ex.name }}</span>
             <span class="teach">{{ ex.teaches }}</span>
diff --git a/showcase/gallery.json b/showcase/gallery.json
index 0d809a8b..d7693b84 100644
--- a/showcase/gallery.json
+++ b/showcase/gallery.json
@@ -9,6 +9,7 @@
       "name": "shipping-crate",
       "dir": "showcase/shipping-crate",
       "teaches": "A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden shipping crate with dark corner posts, horizontal planks and a metal handle.",
       "witnessesFix": "Recomputed: 2508 tris, two materials with 1170 wood and 280 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.146×0.726×0.612 m, grounded zmin, 3 skids, handle-end and slat-post join 0, mesh hygiene all zero, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 76 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-skids 16; --float-handle 17; --omit-slats 18.",
       "hero": "docs/gallery/assets/shipping-crate-hero.webp",
       "preview": "showcase/shipping-crate/preview.webp",
@@ -21,6 +22,7 @@
       "name": "stone-well",
       "dir": "showcase/stone-well",
       "teaches": "A procedural stone well through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A round stone well of grey blocks under a four-post wooden roof, with a bucket hanging inside.",
       "witnessesFix": "Recomputed: 9380 tris, three materials with face floors, UVs in 0..1 with zero AABB overlap, outer AABB 1.312×1.312×1.761 m, LOD ratios in band, convex collider 346 tris, hygiene zero (loose, non-manifold, doubles, n-gons), zero coplanar cross-shell face pairs, all 12 bottom-course stones on the floor, each post tenoned 18 mm into the measured coping and standing under a roof hip corner, the bucket hanging 0.10 m clear of the coping, grounded zmin, non-empty glTF. --stand-posts exits 15 on the z-fight budget; --float-stone exits 16 on the named-support budget; --shallow-tenon and --drop-bucket exit 18; --turn-posts exits 19 on post placement; --skip-decimate exits 9 on the LOD1 ratio budget; --lift-z exits 16 on the grounded budget.",
       "hero": "docs/gallery/assets/stone-well-hero.webp",
       "preview": "showcase/stone-well/preview.webp",
@@ -34,6 +36,7 @@
       "name": "wooden-barrel",
       "dir": "showcase/wooden-barrel",
       "teaches": "A procedural wine-cask with croze-seated heads and chord-lofted hoops through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden stave barrel bound by three metal hoops.",
       "witnessesFix": "Recomputed: 7216 tris, two materials with 2512 wood and 1440 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.722×0.714×0.880 m, 20 grounded staves, hoop bite 0.003 m, head-croze gap 0.007 m, LOD ratios in band, convex collider 238 tris, non-empty glTF. --skip-decimate exits 9; --round-band exits 18 on the hoop-seat budget.",
       "hero": "docs/gallery/assets/wooden-barrel-hero.webp",
       "preview": "showcase/wooden-barrel/preview.webp",
@@ -46,6 +49,7 @@
       "name": "campfire",
       "dir": "showcase/campfire",
       "teaches": "A procedural campfire through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A campfire of crossed logs in a teepee inside a ring of grey stone blocks.",
       "witnessesFix": "Recomputed: 2200 tris, three materials with 216 wood, 48 ash and 1304 stone faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.807×0.808×0.404 m, LOD ratios in band, convex collider 198 tris, hygiene 0, 14 grounded bottom stones, teepee kiss 0.00001 m, course seat 0, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-stones 16; --float-logs 17; --gap-courses 18.",
       "hero": "docs/gallery/assets/campfire-hero.webp",
       "preview": "showcase/campfire/preview.webp",
@@ -58,6 +62,7 @@
       "name": "market-stall",
       "dir": "showcase/market-stall",
       "teaches": "A procedural timber market stall through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A timber market stall with a red and white striped awning and a counter with shelves.",
       "witnessesFix": "Recomputed: 4324 tris, three materials with 34 faces per awning stripe slot, UVs in 0..1 with zero AABB overlap, outer AABB 1.389×1.011×1.740 m, grounded zmin, 4 wrap feet, brace-counter overlap 0, awning seat 4 mm, post plumb 0, LOD ratios in band, convex collider 58 tris, non-empty glTF. Hygiene all zero. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-feet 16; --low-brace 17; --float-awning 18; --rake-posts 19.",
       "hero": "docs/gallery/assets/market-stall-hero.webp",
       "preview": "showcase/market-stall/preview.webp",
@@ -71,6 +76,7 @@
       "name": "street-lantern",
       "dir": "showcase/street-lantern",
       "teaches": "A procedural hanging street lantern through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A black iron street lamp post with an arm holding a hanging lantern with glowing panes.",
       "witnessesFix": "Recomputed: 3338 tris, three materials with 1530 metal, 24 glass and 209 brass faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.300×0.786×1.287 m, zmin 0, hygiene 0, brace BVH gap 0, hanger-roof gap −1 mm, post 0.100×1.120 m plumb 0, LOD ratios in band (5.2 COLLAPSE 2 tris leaner on LOD2), convex collider 78 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-brace 17; --sink-arm 18; --rake-post 19.",
       "hero": "docs/gallery/assets/street-lantern-hero.webp",
       "preview": "showcase/street-lantern/preview.webp",
@@ -83,6 +89,7 @@
       "name": "treasure-chest",
       "dir": "showcase/treasure-chest",
       "teaches": "A procedural iron-bound chest with a lofted barrel-vault lid, U-wrap bands, and hinge knuckles through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "An open wooden treasure chest with a vaulted lid and dark iron bands.",
       "witnessesFix": "Recomputed: 3852 tris, two materials with 1608 wood and 318 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.764×0.542×0.691 m, LOD ratios in band, convex collider 176 tris, non-empty glTF. Hygiene all zero, four feet at zmin 0, lid-knuckle to hinge barrel 7 mm, band-wall gap 0. --float-hinge exits 17 on the hinge join; --narrow-bands exits 18 on the band seat.",
       "hero": "docs/gallery/assets/treasure-chest-hero.webp",
       "preview": "showcase/treasure-chest/preview.webp",
@@ -95,6 +102,7 @@
       "name": "terrain-scatter",
       "dir": "showcase/terrain-scatter",
       "teaches": "A Geometry Nodes hill tile with seated icosphere scatter through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A square tile of sandy rolling terrain with pale rocks scattered on the hill.",
       "witnessesFix": "Recomputed: 1758 tris, two materials with 720 stone faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.800×1.800×0.552 m, grounded zmin, 9 stones of ≥80 faces seated on sampled dirt Z (offset −35 mm, floor zmin 0.113 m), LOD ratios in band, convex collider 81 tris, hygiene zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --poke-rock 17; --float-rocks 18; --box-rocks 19.",
       "hero": "docs/gallery/assets/terrain-scatter-hero.webp",
       "preview": "showcase/terrain-scatter/preview.webp",
@@ -107,6 +115,7 @@
       "name": "fence-kit",
       "dir": "showcase/fence-kit",
       "teaches": "A procedural post-and-rail fence section whose brace is an oriented box between named post stations, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A section of wooden post-and-rail fence with a diagonal brace and dark iron collars.",
       "witnessesFix": "Recomputed: 1092 tris, two materials with 156 metal and 390 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.624×0.134×1.232 m, grounded zmin, 2 iron shoes, brace-to-post gap 2.4 mm on both posts, rail-to-post gap 0.93 mm, rail span 1.390 m, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 32 tris, hygiene all zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-shoes 16; --short-brace 17; --gap-rails 18; --long-rails 19.",
       "hero": "docs/gallery/assets/fence-kit-hero.webp",
       "preview": "showcase/fence-kit/preview.webp",
@@ -119,6 +128,7 @@
       "name": "watchtower",
       "dir": "showcase/watchtower",
       "teaches": "A procedural timber watchtower through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A timber watchtower on braced legs with a ladder, railed platform and a pale shingled pyramid roof.",
       "witnessesFix": "Recomputed: 6408 tris, three materials with 300 metal and 126 roof faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.594×1.594×2.973 m, grounded zmin, 4 iron shoes, rail engage 18 mm, collar standoff 2 mm, post plumb 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 150 tris, non-empty glTF. Hygiene all zero. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-shoes 16; --short-rails 17; --float-band 18; --rake-posts 19.",
       "hero": "docs/gallery/assets/watchtower-hero.webp",
       "preview": "showcase/watchtower/preview.webp",
@@ -131,6 +141,7 @@
       "name": "cart",
       "dir": "showcase/cart",
       "teaches": "A procedural two-wheel wooden cart through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A two-wheeled wooden cart with spoked wheels, an open box bed and long shafts resting on the floor.",
       "witnessesFix": "Recomputed: 2856 tris, two materials with metal and wood face floors, UVs in 0..1 with zero AABB overlap, outer AABB 1.539×0.749×0.640 m, LOD ratios in band, convex collider 154 tris, hygiene zero (loose, non-manifold, doubles, n-gons), zero coplanar cross-shell face pairs, both tyres grounded, tyre seat depth in band over 48 angular stations, the two wheels mirrored within 5e-5 m, grounded zmin, non-empty glTF. --flush-tyre exits 15 on the z-fight budget; --sink-tyre exits 18 on the tyre seat band; --float-wheel exits 16 on the named-support budget; --skew-wheel exits 19 on the wheel mirror; --skip-decimate exits 9 on the LOD1 ratio budget; --lift-z exits 16 on the grounded budget.",
       "hero": "docs/gallery/assets/cart-hero.webp",
       "preview": "showcase/cart/preview.webp",
@@ -144,6 +155,7 @@
       "name": "park-bench",
       "dir": "showcase/park-bench",
       "teaches": "A procedural wrought-iron park bench with tangent tube scroll feet through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A park bench of wooden slats on a wrought-iron frame with scrolled feet and armrests.",
       "witnessesFix": "Recomputed: 2520 tris, two materials with 540 metal and 756 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.295×0.632×0.884 m, grounded zmin, 4 named toes, stretcher gap 1.2 mm, slat gap 0.3 mm, seat span 1.272 m, LOD ratios in band, convex collider 82 tris, hygiene zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-feet 16; --float-stretcher 17; --gap-slats 18; --narrow-seat 19.",
       "hero": "docs/gallery/assets/park-bench-hero.webp",
       "preview": "showcase/park-bench/preview.webp",
@@ -157,6 +169,7 @@
       "name": "wheelbarrow",
       "dir": "showcase/wheelbarrow",
       "teaches": "A procedural wooden wheelbarrow through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden wheelbarrow with a box tray, spoked front wheel and two long handles.",
       "witnessesFix": "Recomputed: 2500 tris, two materials with 1094 wood and 190 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.556×0.630×0.572 m, zmin 0, hygiene 0, wall-floor seat 12 mm, spoke clearance 40 mm, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 90 tris, non-empty glTF. --skip-decimate exits 9 on LOD1; --stray-vert exits 15 on hygiene; --lift-z / --short-legs exit 16 on grounded; --fat-spokes / --float-walls exit 17 on joint fit; --pipe-rim exits 18 on tread aspect.",
       "hero": "docs/gallery/assets/wheelbarrow-hero.webp",
       "preview": "showcase/wheelbarrow/preview.webp",
@@ -169,6 +182,7 @@
       "name": "anvil",
       "dir": "showcase/anvil",
       "teaches": "A procedural blacksmith anvil on a timber stump through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A black iron anvil mounted on a hooped timber stump.",
       "witnessesFix": "Recomputed: 2988 tris, two materials with 1040 wood and 822 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.621×0.414×0.489 m, LOD ratios in band, convex collider 134 tris, hygiene 0, 16 grounded staves, hoop bite 0.003 m, foot-on-head gap 0.003 m, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-staves 16; --float-anvil 17; --round-band 18.",
       "hero": "docs/gallery/assets/anvil-hero.webp",
       "preview": "showcase/anvil/preview.webp",
@@ -181,6 +195,7 @@
       "name": "water-trough",
       "dir": "showcase/water-trough",
       "teaches": "A procedural watertight water trough through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A curved wooden water trough on crossed trestle legs, filled with dark green water.",
       "witnessesFix": "Recomputed: 3700 tris, three materials with 1674 wood, 156 metal and 29 water faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.093×0.552×0.504 m, zmin 0, four shoes planted, U end-cap rim span 5 mm, strap BVH gap 0, water-hull gap 2.6 mm, hull 1.045×0.466 m, LOD ratios in band, convex collider 64 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --box-ends 17; --float-strap 18; --narrow-hull 19.",
       "hero": "docs/gallery/assets/water-trough-hero.webp",
       "preview": "showcase/water-trough/preview.webp",
@@ -193,6 +208,7 @@
       "name": "hitching-post",
       "dir": "showcase/hitching-post",
       "teaches": "A procedural hitching post (eaved cap, one rail, cup shoe, rings hung through eyes) through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A tall wooden hitching post with a pointed cap, a crossbar and two iron rings.",
       "witnessesFix": "Recomputed: 1680 tris, two materials with 114 wood and 742 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.500×0.149×1.246 m, zmin 0, hygiene and coplanar pairs 0, post seated at z 0.010, ring centerline error 0, LOD ratios in band, convex collider 80 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert and --twin-sole exit 15; --lift-z exits 16; --clip-ring exits 18; --short-post exits 19.",
       "hero": "docs/gallery/assets/hitching-post-hero.webp",
       "preview": "showcase/hitching-post/preview.webp",
@@ -205,6 +221,7 @@
       "name": "grindstone",
       "dir": "showcase/grindstone",
       "teaches": "A procedural grindstone on a timber trestle through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A round grey grindstone with a crank handle, mounted in a wooden A-frame trestle.",
       "witnessesFix": "Recomputed: 928 tris, three materials with 216 wood / 160 stone / 180 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.710×0.419×0.610 m, zmin 0, hygiene 0, four shoes planted, trough seated in the sills, stone dip 26 mm, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 198 tris, non-empty glTF. --skip-decimate exits 9 on LOD1; --stray-vert exits 15 on hygiene; --lift-z / --short-legs exit 16 on grounded; --float-crank / --float-legs exit 17 on joint fit; --no-dip / --narrow-trough exit 18 on seat.",
       "hero": "docs/gallery/assets/grindstone-hero.webp",
       "preview": "showcase/grindstone/preview.webp",
@@ -217,6 +234,7 @@
       "name": "hand-pump",
       "dir": "showcase/hand-pump",
       "teaches": "A procedural village hand pump whose gooseneck is a 6-gon tube from the lower-column radius, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A dark iron village hand pump with a curved spout and lever handle on a square wooden plinth.",
       "witnessesFix": "Recomputed: 1064 tris, two materials with 564 metal and 144 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.610×0.382×1.052 m, grounded zmin, spout-to-column gap 2.7 mm, flange-to-plinth gap 6.0 mm, column radius 62 mm, LOD ratios in band, convex collider 114 tris, hygiene all zero, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-spout 17; --float-flange 18; --skinny-col 19.",
       "hero": "docs/gallery/assets/hand-pump-hero.webp",
       "preview": "showcase/hand-pump/preview.webp",
@@ -229,6 +247,7 @@
       "name": "signpost",
       "dir": "showcase/signpost",
       "teaches": "A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden signpost with two pointed finger boards and dark iron bands on the post.",
       "witnessesFix": "Recomputed: 376 tris, three materials with 108 metal, 22 board and 60 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.260×0.142×1.551 m at zmin 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD1/LOD2), convex collider 52 tris, non-empty glTF. Hygiene all zero. Board-to-post gap 5 mm, strap gap 3 mm, board AABB Y 28 mm. --skip-decimate exits 9; --stray-vert 15; --lift-z / --short-shoe 16; --gap-board 17; --float-strap 18; --yaw-boards 19.",
       "hero": "docs/gallery/assets/signpost-hero.webp",
       "preview": "showcase/signpost/preview.webp",
@@ -241,6 +260,7 @@
       "name": "chopping-block",
       "dir": "showcase/chopping-block",
       "teaches": "A procedural log-round chopping block with a riveted iron hoop and a felling axe buried in the sawn face, through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A log-round chopping block bound with an iron hoop, an axe buried in its top.",
       "witnessesFix": "Recomputed: 1800 tris, four materials with 180 bark / 216 grain / 404 metal / 176 haft faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.526 x 0.526 x 1.006 m, LOD ratios in band, convex collider 538 tris, non-empty glTF. Hygiene: zero non-manifold edges, loose geometry, doubles, zero-area faces, n-gons and coplanar disjoint face pairs, grounded at zmin 0, log plumb to 1e-7, oval haft 1.35 wide-to-thick. Joint fit: six shells, 18.0 mm haft clearance in the eye, 78.7 mm bit bury, hoop biting 3.7-4.2 mm into the log on every segment, two lap rivets seated 1.50 and 1.54 mm. --fat-haft exits 17 on eye clearance; --round-band and --float-rivets exit 18 on their seats; --round-haft exits 19 on the haft section.",
       "hero": "docs/gallery/assets/chopping-block-hero.webp",
       "preview": "showcase/chopping-block/preview.webp",
@@ -253,6 +273,7 @@
       "name": "wooden-bucket",
       "dir": "showcase/wooden-bucket",
       "teaches": "A procedural coopered pail with a croze-seated floor, chord-lofted hoops, and a round bail through the ear rings through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden stave bucket with metal hoops and a curved wooden bail handle.",
       "witnessesFix": "Recomputed: 4872 tris, three materials with 1424 wood, 1020 metal, and 208 rope faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.383×0.346×0.527 m, 16 grounded staves, hoop bite 0.0025 m, bail-ear gap 0.0013 m, LOD ratios in band, convex collider 302 tris, non-empty glTF. --skip-decimate exits 9; --float-handle exits 17 on the bail-ear budget.",
       "hero": "docs/gallery/assets/wooden-bucket-hero.webp",
       "preview": "showcase/wooden-bucket/preview.webp",
@@ -265,6 +286,7 @@
       "name": "wall-torch",
       "dir": "showcase/wall-torch",
       "teaches": "A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wall torch: a stone-block plaque with an iron bracket holding a bowl with a flame, casting warm light on the floor.",
       "witnessesFix": "Recomputed: 1528 tris, four materials with 540 stone, 228 metal and 78 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.304×0.293×0.424 m at zmin 0, LOD ratios in band, convex collider 60 tris, non-empty glTF. Hygiene all zero. Arm-to-cup gap 0.87 mm, plate-to-plaque gap 4 mm, plaque width 0.280 m. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-arm 17; --float-plate 18; --skinny-plaque 19.",
       "hero": "docs/gallery/assets/wall-torch-hero.webp",
       "preview": "showcase/wall-torch/preview.webp",
@@ -278,6 +300,7 @@
       "name": "tavern-stool",
       "dir": "showcase/tavern-stool",
       "teaches": "A procedural tavern stool with a lathed seat, turned splayed legs, tenoned stretchers, and iron ferrule cups through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden tavern stool with a round seat, turned splayed legs and stretcher rungs.",
       "witnessesFix": "Recomputed: 2528 tris, two materials with 1168 wood and 256 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.340×0.340×0.470 m, LOD ratios in band, convex collider 396 tris, non-empty glTF. Hygiene all zero, four ferrule cups at zmin 0, stretcher-leg gap 0, ferrule clearance −1.25 mm. --float-stretchers exits 17 on the stretcher join; --pipe-ferrule exits 18 on the ferrule bite band.",
       "hero": "docs/gallery/assets/tavern-stool-hero.webp",
       "preview": "showcase/tavern-stool/preview.webp",
@@ -290,6 +313,7 @@
       "name": "iron-cauldron",
       "dir": "showcase/iron-cauldron",
       "teaches": "A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A black iron cauldron hanging from a tripod of wooden poles.",
       "witnessesFix": "Recomputed: 3664 tris, two materials with 224 wood and 1768 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.987×0.961×0.860 m, pot–leg clearance 0.046 m, 3 coaxial ferrules at zmin 0, ferrule bite −0.00185 m, hook-bail join 0, mesh hygiene all zero, LOD ratios in band, convex collider 250 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --float-hook 17; --pipe-ferrule 18.",
       "hero": "docs/gallery/assets/iron-cauldron-hero.webp",
       "preview": "showcase/iron-cauldron/preview.webp",
@@ -302,6 +326,7 @@
       "name": "wooden-ladder",
       "dir": "showcase/wooden-ladder",
       "teaches": "A procedural timber ladder with raked tapered stiles, six turned rungs, ferrule caps, and level shoe plates through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A wooden ladder with tapered stiles and round rungs, leaning at an angle.",
       "witnessesFix": "Recomputed: 2536 tris, two materials with 612 wood and 736 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.490×0.376×1.487 m, zmin 0, hygiene and coplanar pairs 0, tenon clearance 8 mm, shoe bite 20 mm, LOD ratios in band, convex collider 24 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert and --twin-sole exit 15; --lift-z exits 16; --fat-rungs exits 17; --short-stile exits 18.",
       "hero": "docs/gallery/assets/wooden-ladder-hero.webp",
       "preview": "showcase/wooden-ladder/preview.webp",
@@ -314,6 +339,7 @@
       "name": "hay-bale",
       "dir": "showcase/hay-bale",
       "teaches": "A bound hay bale whose twine belts follow the loaf's own raycast cross-section, asserting recomputed geometry budgets, not an API contract.",
+      "alt": "A rectangular hay bale bound by two twine belts.",
       "witnessesFix": "Recomputed: 2012 tris, two materials with 712 hay and 304 twine faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.921x0.530x0.409 m, zmin 0, hygiene and cross-shell z-fight 0, 5 shells, each belt wrapping under the loaf at zmin 2.6 mm, banded belt seat depth 4.0-16.8 mm over 20/20 stations on both belts, belt mirror error 0, cinch depth 14.2 mm, LOD ratios in band, convex collider 156 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z and --float-belts 16; --slack-belt 18; --skew-belt 19.",
       "hero": "docs/gallery/assets/hay-bale-hero.webp",
       "preview": "showcase/hay-bale/preview.webp",
@@ -326,6 +352,7 @@
       "name": "crate-stack",
       "dir": "showcase/crate-stack",
       "teaches": "A stack of three procedural shipping crates built by one generator called three times with a per-instance seed, carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "Three wooden shipping crates stacked, each turned slightly differently.",
       "witnessesFix": "Recomputed: 4380 tris, two materials with 216 iron and 2436 timber faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.658×0.524×0.704 m, zmin 0, hygiene 0 including zero coplanar disjoint pairs, three ground runners at z=0, both crate-to-crate seats overlapping, each crate's own footprint 0.585×0.425 m measured in its own frame, yaw spread 0.026 rad and plank spread 2.05 mm across instances, LOD ratios in band, convex collider 202 tris, non-empty glTF. --float-stack exits 18 on the seat; --same-seed exits 20 on per-instance variation.",
       "hero": "docs/gallery/assets/crate-stack-hero.webp",
       "preview": "showcase/crate-stack/preview.webp",
@@ -338,6 +365,7 @@
       "name": "stone-archway",
       "dir": "showcase/stone-archway",
       "teaches": "A procedural masonry archway — coursed piers, projecting imposts, nine voussoirs and a proud keystone — carried through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
+      "alt": "A freestanding stone archway of coursed piers and a semicircular arch with a keystone.",
       "witnessesFix": "Recomputed: 924 tris, two materials with 182 dressed and 364 ashlar faces re-stamped after the chamfer, UVs in 0..1 with zero AABB overlap, outer AABB 1.644×0.510×2.057 m, clear opening 1.203 m, zmin 0, hygiene 0 including zero coplanar disjoint pairs, both piers grounded, the springing joint an overlap, all eight mortar joints at 9.70 mm inside the 6–17 mm band, and every intrados vertex within 0.97 mm of the declared 0.60 m radius over 178°. --off-circle exits 19 on the circle fit; --wide-mortar exits 18 on the joint band.",
       "hero": "docs/gallery/assets/stone-archway-hero.webp",
       "preview": "showcase/stone-archway/preview.webp",