feat(showcase): add basketball-hoop (sports)

First piece in the sports category: an outdoor in-ground basketball goal.
Parts: an anchor plate with gussets and anchor bolts; a pole swept in one
piece through an S-shaped gooseneck into the mast; a padded pole; two
support braces from a collar to the board's back rail; a framed backboard
with an edge pad, painted border and shooter's square; a regulation rim
on a tapered bracket, bolted through a flange, with 12 net hooks; and a
white cord net of 12 loops hung on the hooks feeding 24 crossing strands.

Blender: E:\Blender-Developer-Tools\.scratch\5.2\blender-5.2.1-windows-x64\blender.exe
reports "Blender 5.2.1 LTS". 4.5 LTS and 5.1 are left to CI (not run locally).

Recomputed budgets (5.2.1):
- 9356 tris (band 8700-10000); LOD1 0.5000, LOD2 0.2200
- 6 materials: steel 2206, board 54, paint 32, rim 916, net 1344, pad 368 faces
- UVs in 0..1, overlap 0; AABB 1.846 x 2.054 x 3.950 m, zmin 0
- collider 200 tris (ceiling 220); bake FINISHED; glTF 694224 B
- hygiene all 0, including coplanar cross-shell pairs
- brace bite 7.03 mm into the collar and 21.76 mm into the rail
- net seat: 12 hooks and 12 loops; worst eye-to-loop distance 7.0 mm (max 9 mm)
- rim top 3.0500 m, ID 0.4570 m, inner edge 0.1510 m off the board, tilt 0.000 deg
- 1 connected component (93 shells)
- two default runs print identical measurements

Falsifiers (flag -> measured -> exit):
- --skip-decimate -> LOD1 ratio 1.0000 -> 9
- --stray-vert -> loose_v 1 -> 15
- --lift-z -> zmin 0.05000 -> 16
- --short-brace -> rail bite -0.02125 m -> 17
- --drop-net -> worst eye-to-loop 0.03200 m -> 18
- --tilt-rim -> rim tilt 3.000 deg -> 19
- --loose-pad -> 2 components [1, 92] -> 20

The envelope was unchanged under every falsifier; --tilt-rim moves Y by
0.9 mm against a 10 mm tolerance.

Render: render_hero.py wrote the hero and preview. Framing: fill y 0.822,
min margin 0.072. Asset-quality floors pass (edge90 0.064); a violation
is remapped to exit 21.

Asset sheet (docs/gallery/asset-sheets/basketball-hoop.webp): not the
least-designed object in the lineup. It shows more distinct parts and
materials than the hydrant, and reads unambiguously as a hoop. It is the
thinnest silhouette, though: a 4 m prop fitted to the panel leaves the
pole and braces as thin lines, and the board face is a large plain area.

Contact sheet: luma 0.256 against calibration 0.237-0.243; stage 0.264
against 0.192-0.252 (slightly bright, closest to bmesh-gear); warm wedge
+0.099 against +0.092/+0.105; saturation 0.224 against 0.153-0.237.
Thumbnail legibility is good: the board, rim and net read. Subject fill
is the weak criterion: the piece is tall and narrow, with 0.82 vertical
fill and 0.20 horizontal.

Also: README, CLAUDE.md and ROADMAP counts and entries; the asset_sheet.py
SELECT row; the gallery regenerated. build_gallery, check_site_links
(92 pages, 0 failures), check_falsifier_targets, check_exit_code_readme,
check_engine_id and check_gallery_images all pass.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -174,6 +174,7 @@
     "showcase/wooden-yoke",
     "showcase/butter-churn",
     "showcase/bookshelf",
-    "showcase/book-trolley"
+    "showcase/book-trolley",
+    "showcase/basketball-hoop"
   ]
 }

CLAUDE.md

@@ -22,7 +22,7 @@ rules/<rule-name>.mdc          - Anti-pattern rules, 9 total
 templates/<template-name>/     - Starter projects, 3 total
 snippets/<snippet-name>.py     - Standalone code patterns, 27 total
 examples/<name>/               - Runnable smoke-gated examples, 60 total (+ gallery.json)
-showcase/<name>/               - Budget-conformance props, 36 pieces, each with a gallery `category` (sibling of examples/; see showcase/README.md § Categories)
+showcase/<name>/               - Budget-conformance props, 37 pieces, each with a gallery `category` (sibling of examples/; see showcase/README.md § Categories)
 scripts/build_gallery.py       - Regenerates docs/gallery/ from examples/gallery.json + showcase/gallery.json
 scripts/site/                  - Vendored landing-page build (Jinja2); tokens.css is the shared palette
 tests/check_site_links.py      - Internal link/anchor/alt gate over the built site (docs/)

README.md

@@ -18,7 +18,7 @@
 </p>
 
 <p align="center">
-  <strong>16 skills</strong> &nbsp;&bull;&nbsp; <strong>9 rules</strong> &nbsp;&bull;&nbsp; <strong>3 templates</strong> &nbsp;&bull;&nbsp; <strong>27 snippets</strong> &nbsp;&bull;&nbsp; <strong>60 examples</strong> &nbsp;&bull;&nbsp; <strong>36 showcase pieces</strong>
+  <strong>16 skills</strong> &nbsp;&bull;&nbsp; <strong>9 rules</strong> &nbsp;&bull;&nbsp; <strong>3 templates</strong> &nbsp;&bull;&nbsp; <strong>27 snippets</strong> &nbsp;&bull;&nbsp; <strong>60 examples</strong> &nbsp;&bull;&nbsp; <strong>37 showcase pieces</strong>
 </p>
 
 <p align="center">
@@ -37,7 +37,7 @@
 
 ## Overview
 
-This repository ships **16 skills, 9 rules, 3 templates, 27 snippets, 60 examples, and 36 showcase pieces** for Blender Python development targeting Blender 5.2 LTS (current stable) with Blender 4.5 LTS fallback support. Blender 5.1 is prior stable.
+This repository ships **16 skills, 9 rules, 3 templates, 27 snippets, 60 examples, and 37 showcase pieces** for Blender Python development targeting Blender 5.2 LTS (current stable) with Blender 4.5 LTS fallback support. Blender 5.1 is prior stable.
 
 The content is consumed by AI coding agents reading these files directly from a checkout — **there is no MCP server in this repository, and none is required**. Cursor applies `rules/*.mdc` automatically wherever their scope globs match and takes skills by name in chat; Claude Code reads `skills/` and `rules/` from the project workspace, or from this repo kept as a referenced checkout. Any agent that can read files in a workspace can use it the same way. There is no build step for the content — edit the Markdown and Python files directly.
 
@@ -106,7 +106,7 @@ per-script exit-code model, are in
 Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](showcase/README.md).
 
 <details>
-<summary><strong>36 showcase pieces</strong> — click to expand the preview grid</summary>
+<summary><strong>37 showcase pieces</strong> — click to expand the preview grid</summary>
 
 <p align="center">
   <a href="showcase/shipping-crate/"><img src="showcase/shipping-crate/preview.webp" width="24%" alt="Shipping crate: a wooden slat crate stencilled PORT ROYAL and NO 17, with iron corner brackets and an end handle, on a dark studio floor, warm wedge on the back wall" /></a>
@@ -145,6 +145,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
   <a href="showcase/butter-churn/"><img src="showcase/butter-churn/preview.webp" width="24%" alt="Butter churn: a tall staved oak churn narrowing toward the top, bound by three iron hoops, with a two-board lid and a maple dasher handle rising through it, on a dark studio floor" /></a>
   <a href="showcase/bookshelf/"><img src="showcase/bookshelf/preview.webp" width="24%" alt="Bookshelf: a stained wooden bookcase of cloth and leather hardbacks, some standing, some stacked flat and two leaning on their neighbours, on a dark studio floor" /></a>
   <a href="showcase/book-trolley/"><img src="showcase/book-trolley/preview.webp" width="24%" alt="Book trolley: a double-sided wooden library book truck on four casters, two sloped troughs of hardbacks leaning back spines out and loose books stacked on its deck, on a dark studio floor" /></a>
+  <a href="showcase/basketball-hoop/"><img src="showcase/basketball-hoop/preview.webp" width="24%" alt="Basketball hoop: an outdoor in-ground goal with a padded steel gooseneck pole, a framed backboard with a red shooter's square, an orange rim and a white corded net, on a dark studio floor" /></a>
 </p>
 
 [`shipping-crate`](showcase/shipping-crate/) — procedural crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets. Falsifier `--skip-decimate` exits 9.
@@ -215,6 +216,8 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`book-trolley`](showcase/book-trolley/) — procedural double-sided library book truck on four casters, forty-seven hardbacks in four sloped troughs, whose every book's fore-edge depth in its backrest is recomputed as a band beside its shelf seat, through the same pipeline. Falsifiers `--off-back` and `--deep-back` exit 21, `--skew-caster` exits 19.
 
+[`basketball-hoop`](showcase/basketball-hoop/) — the first `sports` piece: procedural in-ground basketball goal (gooseneck pole swept in one piece, braced board, regulation rim, twelve-loop tapered net), whose rim top height, inside diameter, board gap and level, and every net loop threaded on its rim hook, are recomputed from the mesh, through the same pipeline. Falsifiers `--drop-net` exits 18, `--tilt-rim` 19, `--loose-pad` 20.
+
 </details>
 
 ## Examples

ROADMAP.md

@@ -156,7 +156,7 @@ Not committed; target list for the next content version. (v0.3.0 shipped the smo
 - Rowboat with oars in oarlocks as a game-prop showcase piece — oar shafts passing through the oarlock horns with clearance inside a band, hull resting on its keel line on a flat deck/floor
 - Weathervane as a game-prop showcase piece — arrow and cardinal arms on a spindle: the arrow's pivot bore coaxial with the spindle and the arrow statically balanced (centroid on the pivot axis within a band)
 - Showcase pieces above this line are category `village`. Candidates for the other categories (`showcase/README.md` § Categories):
-  - **Sports:** basketball hoop (pole, backboard, rim, hung net), soccer goal (tube frame, netting), tennis net on posts, weight rack with plates and dumbbells; alternates bowling pins and ball, skateboard
+  - **Sports:** ~~basketball hoop (pole, backboard, rim, hung net)~~ **SHIPPED** as `showcase/basketball-hoop/` — gooseneck pole on a bolted anchor plate, braced framed board with painted square, regulation rim, twelve-loop net hung on the rim hooks; `--drop-net` exits 18 on the loops threaded through the hooks while the envelope holds, `--tilt-rim` 19 on rim height/size/level, `--skip-decimate` 9 on the LOD1 ratio band; soccer goal (tube frame, netting), tennis net on posts, weight rack with plates and dumbbells; alternates bowling pins and ball, skateboard
   - **Nature:** pine tree (trunk, tiered branch whorls), boulder cluster, fallen log with fungus, tree stump with mushrooms; alternates flowering shrub, cattail reeds
   - **Household:** articulated desk lamp, office chair (five-star base, casters), kitchen stool, mini fridge; alternates floor fan, laundry basket
   - **Vehicles:** traffic cone and barrier set, quad drone, hover bike, sci-fi cargo loader; alternates sci-fi supply crate

docs/gallery/anvil/index.html

@@ -358,7 +358,7 @@ <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">
-    <nav class="pager" aria-label="Showcase pieces"><a rel="prev" href="../wheelbarrow/" aria-label="Previous showcase piece: wheelbarrow"><span aria-hidden="true">&larr;</span> wheelbarrow</a><span class="pager-pos hud">14 of 36 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../water-trough/" aria-label="Next showcase piece: water-trough">water-trough <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager" aria-label="Showcase pieces"><a rel="prev" href="../wheelbarrow/" aria-label="Previous showcase piece: wheelbarrow"><span aria-hidden="true">&larr;</span> wheelbarrow</a><span class="pager-pos hud">14 of 37 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../water-trough/" aria-label="Next showcase piece: water-trough">water-trough <span aria-hidden="true">&rarr;</span></a></nav>
     <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A forged-steel anvil with a hammer-polished face and a flared, squared waist on a hooped timber stump, a cross-peen hammer on the floor and forge light on its flank.">
       <img src="../assets/anvil-hero.webp" alt="A forged-steel anvil with a hammer-polished face and a flared, squared waist on a hooped timber stump, a cross-peen hammer on the floor and forge light on its flank." width="1280" height="720" fetchpriority="high" />
     </button>
@@ -3716,7 +3716,7 @@ <h3><a href="../wooden-barrel/">wooden-barrel</a></h3>
         </article>
       </div>
     </section>
-    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../wheelbarrow/" aria-label="Previous showcase piece: wheelbarrow"><span aria-hidden="true">&larr;</span> wheelbarrow</a><span class="pager-pos hud">14 of 36 showcase pieces</span><a rel="next" href="../water-trough/" aria-label="Next showcase piece: water-trough">water-trough <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../wheelbarrow/" aria-label="Previous showcase piece: wheelbarrow"><span aria-hidden="true">&larr;</span> wheelbarrow</a><span class="pager-pos hud">14 of 37 showcase pieces</span><a rel="next" href="../water-trough/" aria-label="Next showcase piece: water-trough">water-trough <span aria-hidden="true">&rarr;</span></a></nav>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>

docs/gallery/apothecary-shelf/index.html

@@ -358,7 +358,7 @@ <h1>apothecary-shelf</h1>
     <p>A procedural apothecary shelf — housed shelves, gallery rails, a drawer bank and an arched crest, stocked with fifteen lathed bottles, flasks and glazed jars, each corked or lidded and labelled — carried through UVs, bake, LOD, convex collider, and Unity glTF, asserting recomputed budgets rather than an API contract.</p>
   </header>
   <main id="main">
-    <nav class="pager" aria-label="Showcase pieces"><a rel="prev" href="../brazier/" aria-label="Previous showcase piece: brazier"><span aria-hidden="true">&larr;</span> brazier</a><span class="pager-pos hud">32 of 36 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../wooden-yoke/" aria-label="Next showcase piece: wooden-yoke">wooden-yoke <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager" aria-label="Showcase pieces"><a rel="prev" href="../brazier/" aria-label="Previous showcase piece: brazier"><span aria-hidden="true">&larr;</span> brazier</a><span class="pager-pos hud">32 of 37 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../wooden-yoke/" aria-label="Next showcase piece: wooden-yoke">wooden-yoke <span aria-hidden="true">&rarr;</span></a></nav>
     <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A stained wooden shelf with an arched crest, gallery rails and three brass-knobbed drawers, stocked with labelled glass bottles and flasks and cream and blue glazed jars.">
       <img src="../assets/apothecary-shelf-hero.webp" alt="A stained wooden shelf with an arched crest, gallery rails and three brass-knobbed drawers, stocked with labelled glass bottles and flasks and cream and blue glazed jars." width="1280" height="720" fetchpriority="high" />
     </button>
@@ -3733,7 +3733,7 @@ <h3><a href="../wooden-barrel/">wooden-barrel</a></h3>
         </article>
       </div>
     </section>
-    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../brazier/" aria-label="Previous showcase piece: brazier"><span aria-hidden="true">&larr;</span> brazier</a><span class="pager-pos hud">32 of 36 showcase pieces</span><a rel="next" href="../wooden-yoke/" aria-label="Next showcase piece: wooden-yoke">wooden-yoke <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../brazier/" aria-label="Previous showcase piece: brazier"><span aria-hidden="true">&larr;</span> brazier</a><span class="pager-pos hud">32 of 37 showcase pieces</span><a rel="next" href="../wooden-yoke/" aria-label="Next showcase piece: wooden-yoke">wooden-yoke <span aria-hidden="true">&rarr;</span></a></nav>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <button class="lightbox-close" type="button" autofocus>Close</button>