fix(examples): redesign temp-override-join as a hurricane lantern joined from seven parts

The review found three orange and grey cubes stacked like a bar chart.
That is programmer art, and the render said nothing about joining.

The subject is now a prop that is naturally assembled by a join: a
hurricane lantern built as seven part objects (fount, glass globe, wire
guard, side air tubes, bell cap, bail with wooden grip, brasswork). Each
part has its own mesh, materials and object transform. One object.join
under temp_override turns them into the single Lantern object. The hero
is that joined object, and it shows five materials only because the join
merged the slots and remapped the per-face indices.

Checks: object count, target identity, sources gone and the Z span are
kept. The Z span is now closed form from foot to grip top, and it proves
the part transforms were applied. Topology is now the sum over the parts.
Two checks are new: the slots must be exactly the five part materials,
once each (exit 8), and faces per material must equal what the parts
brought in (exit 9). The render path now runs gallery_framing (10) and
gallery_asset_quality (11). It had never called the framing gate before.
"no file" moves from 8 to 12. scripts/asset_sheet.py gains a SELECT row.
The ROADMAP floor survey drops temp-override-join from the edge90 list,
since it now measures 0.007.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

Author: TMHSDigital

README.md

@@ -749,15 +749,15 @@ and every orbit lands on its closed form.
 <table>
 <tr>
 <td width="46%" valign="middle">
-<a href="examples/temp-override-join/"><img src="examples/temp-override-join/preview.webp" alt="Temp-override join: an amber three-step staircase of joined unit cubes on a dark studio floor" /></a>
+<a href="examples/temp-override-join/"><img src="examples/temp-override-join/preview.webp" alt="Temp-override join: a red enamel hurricane lantern with a glowing amber globe, wire guard, brass knob and wooden bail grip, joined from seven parts into one object" /></a>
 </td>
 <td valign="middle">
 
 ### [temp-override-join](examples/temp-override-join/)
 
-Three unit cubes joined into a staircase under `bpy.context.temp_override` — the supported
-replacement for the removed `context.copy()` dict-pass form. Asserts one mesh remains,
-sources are gone, and local Z spans all three steps.
+A hurricane lantern joined from seven part objects under `bpy.context.temp_override` — the
+supported replacement for the removed `context.copy()` dict-pass form. Asserts one mesh
+remains, sources are gone, and the five part materials merge with every face kept on its own.
 
 </td>
 </tr>

ROADMAP.md

@@ -224,7 +224,7 @@ any example remodel.
 
 - naming (default datablock names): gltf-skin-roundtrip (3 parts), gn-sdf-remesh (`Torus`), turntable (`Suzanne`)
 - materials (multi-part, single material): armature-bend (3 parts/1 mat — vertex-color weight bands are the honest display), degenerate-bevel-weld (2/1), driver-wave (16/1, also edge90 1.0)
-- edge90 (raw right angles, 1.0): depsgraph-export (also naming + materials), image-pixels-testcard, png-exr-alpha, temp-override-join, text-version-stamp, vse-cut-list; vse-gamma-cross at 0.92
+- edge90 (raw right angles, 1.0): depsgraph-export (also naming + materials), image-pixels-testcard, png-exr-alpha, text-version-stamp, vse-cut-list; vse-gamma-cross at 0.92
 - reference: gallery best-modeled measure collision-hull-proxy 0.044, custom-normals-shade 0.288, vertex-weight-limit 0.150, lod-decimate-chain 0.019; calibration details in `docs/VISUAL-STYLE.md` § Asset quality
 
 ## Future (uncommitted)

docs/gallery/asset-sheets/temp-override-join.webp

@@ -431,12 +431,12 @@ <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="Three amber cubes joined into a single diagonal staircase object, the upper steps standing on grey plinths." loading="lazy" decoding="async" />
+          <img src="assets/temp-override-join-hero.webp" alt="A red enamel hurricane lantern with a glowing amber glass globe, black wire guard, side air tubes, brass wick knob and a wire bail with a wooden grip, all one joined object on a dark studio floor." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="temp-override-join/">temp-override-join</a></h2>
-          <p class="teaches">Join three unit cubes into a staircase under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form.</p>
-          <p class="witnesses"><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.</p>
+          <p class="teaches">Join seven lantern parts into one object under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form.</p>
+          <p class="witnesses"><span class="tag">witnesses</span> temp_override actually applies: join consumes all six sources, exactly one mesh remains, no geometry is lost, the five part materials merge into one slot each with every face still on its own material, and local Z spans foot to grip.</p>
           <a class="card-link" href="temp-override-join/">View example<span class="sr-only"> temp-override-join</span> <span aria-hidden="true">&rarr;</span></a>
         </div>
       </article>

docs/gallery/assets/temp-override-join-hero.webp

@@ -112,9 +112,9 @@
     {
       "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 amber cubes joined into a single diagonal staircase object, the upper steps standing on grey plinths.",
-      "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.",
+      "teaches": "Join seven lantern parts into one object under bpy.context.temp_override — the supported replacement for the removed context.copy() dict-pass form.",
+      "alt": "A red enamel hurricane lantern with a glowing amber glass globe, black wire guard, side air tubes, brass wick knob and a wire bail with a wooden grip, all one joined object on a dark studio floor.",
+      "witnessesFix": "temp_override actually applies: join consumes all six sources, exactly one mesh remains, no geometry is lost, the five part materials merge into one slot each with every face still on its own material, and local Z spans foot to grip.",
       "hero": "docs/gallery/assets/temp-override-join-hero.webp",
       "preview": "examples/temp-override-join/preview.webp",
       "tags": [

docs/gallery/contact-sheets/temp-override-join-contact-sheet.webp

@@ -1,17 +1,32 @@
 # Temp-Override Join
 
-A runnable example that joins three unit cubes into a staircase using
-`bpy.context.temp_override`, following the
+A runnable example that assembles a hurricane lantern from seven separate part objects
+with one `object.join` under `bpy.context.temp_override`, following the
 [`prefer-temp-override-over-context-copy`](../../rules/prefer-temp-override-over-context-copy.mdc)
 rule and the [`operators`](../../skills/operators/SKILL.md) skill: operators that need a
 fabricated active/selection context run under `temp_override(**kwargs)`, not the deprecated
 `bpy.context.copy()` dict-pass form removed in Blender 5.x.
 
-**What it witnesses:** `object.join` under `temp_override` actually consumes the sources.
-The check asserts closed-form topology (verts = 8 × steps, faces = 6 × steps), that exactly
-one mesh remains, that the sources are gone, and that the local Z span covers all three
-steps (`[-0.5, 2.5]`). A no-op override (the 5.x failure mode of the old dict-pass path)
-leaves only step 0 and the Z span fails.
+The parts are the way a prop artist blocks the lantern out: a red enamel fount, an amber
+glass globe, an iron wire guard, the two hurricane side air tubes, the bell cap, the wire
+bail with its wooden grip, and the brass wick knob and filler cap. Each is its own object
+with its own mesh, materials and transform. The join produces the single `Lantern` object an
+engine wants.
+
+**What it witnesses:** `object.join` under `temp_override` actually consumes the sources
+and merges their material slots. The check asserts that exactly one mesh remains and it is
+the target, that all six sources are gone, and that no geometry was lost (verts and faces
+equal the sum over the parts). The joined mesh must carry exactly the five part materials,
+once each, and every material must still own exactly the faces its parts brought. So the
+glass is still glass and the grip is still wood. The local Z span must run from the fount's
+foot (0) to the top of the grip (closed form 2.303), which proves the part transforms were
+applied. A no-op override (the 5.x failure mode of the old dict-pass path) leaves seven
+objects.
+
+**The render is the joined object.** Everything in the still is one mesh object. It shows
+five materials because the slots merged and the per-face indices were remapped. If they had
+not been, the lantern would render in the target's red enamel from grip to foot. A shadowless
+warm point light inside the globe (render-only) stands in for the lit wick.
 
 ## Run
 
@@ -39,10 +54,14 @@ against it.
 | 2 | argparse / usage |
 | 3 | Mesh object count after join ≠ 1 (`--no-override` lands here) |
 | 4 | Joined target is not the sole remaining mesh |
-| 5 | Topology ≠ 24 verts / 18 faces |
+| 5 | Verts / faces ≠ the sum over the seven parts |
 | 6 | Source objects still present |
-| 7 | Local Z span did not cover all steps |
-| 8 | `--output` produced no file |
+| 7 | Local Z span ≠ [0, 2.303]: a part transform was not applied |
+| 8 | Material slots ≠ the five part materials, once each |
+| 9 | Faces per material ≠ what the parts brought (indices not remapped) |
+| 10 | `--output` framing gate (`gallery_framing`) |
+| 11 | `--output` asset-quality floors (`gallery_asset_quality`) |
+| 12 | `--output` produced no file |
 
 The `blender-smoke` workflow runs the check on Blender 5.2 LTS and 4.5 LTS
 (5.1 on the weekly cron, the `needs-5.1` PR label, or manual dispatch).