feat(showcase): add ships-wheel piece

A one-metre, eight-spoke ship's wheel on a pedestal. Turned teak spokes
and handles run to a laminated rim with a 10 mm brass inlay. Brass
ferrules sit where the handles leave the rim, and the king spoke has a
second ring. The brass nave turns on an iron shaft in a bolted brass
collar, over a panelled teak column on a stepped plinth.

Radial witnesses, measured off the finished mesh:
- the nave is 0.0001 mm off the rim's centre;
- the shaft is 0.0004 mm off the nave's axis, with 0.599 mm of bore
  clearance;
- every spoke is seated 3.000 mm into the rim and every handle 4.000 mm;
- spoke spacing is within 0.00013 degrees of k*45, and every handle is
  within 0.00007 degrees of its spoke's axis.

Budgets: 9188 tris. The teak face floor is 2800. LOD1 is 4594 tris;
LOD2 is 2020 on 4.5.11 and 5.1.2 and 2014 on 5.2.1, which is why LOD is
checked as a ratio band. The Unity glTF is about 697 kB. Hygiene is all
zero, with no coplanar faces between shells.

Falsifiers: 21 runs on Blender 4.5.11 LTS, 5.1.2 and 5.2.1 LTS (.scratch
binaries). Each one exits its own code, and the default run exits 0 on
all three.

  --skip-decimate  9   LOD1 ratio 1.0
  --stray-vert    15   one loose vert
  --lift-z        16   zmin 50 mm
  --offset-hub    17   nave 2 mm off the rim centre
  --short-spoke   18   spoke tip 7 mm short of the rim
  --skew-spoke    19   one spoke 2 degrees off its spacing

Asset quality is remapped to exit 21, because 11 is this piece's
collider code.

Review pass:
- The first render's teak read as regular stripes.
- Grain now follows each member's long axis through a GrainCo attribute.
  The rings are irregular, a fine fibre layer sits over them, and each
  member gets its own tone.
- The column's three panelled faces now read at hero distance.

Gates:
- Framing: pass (fill y 0.778). Asset quality: pass (edge90 0.079).
- Contact sheet: luma 0.251, stage 0.243, warmth -0.053, saturation
  0.191, all in family.
- Asset sheet: pass. The wheel is not the least-designed object in the
  reference lineup.
- gallery.json gives the piece the display title "Ship's Wheel".
- scripts/asset_sheet.py gains the WheelLow SELECT row.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -216,6 +216,7 @@
     "showcase/toboggan",
     "showcase/sundial",
     "showcase/mine-cart",
-    "showcase/garden-gate"
+    "showcase/garden-gate",
+    "showcase/ships-wheel"
   ]
 }

AGENTS.md

@@ -21,7 +21,7 @@ classifies it as a `cursor-plugin`. This is content the AI loads when the user
 asks Blender questions or works on Blender add-ons in Cursor or Claude Code.
 
 The content base is 16 skills, 9 rules, 3 templates, 27 snippets, 64
-examples, and 74 showcase pieces (counts are CI-enforced against README.md)
+examples, and 75 showcase pieces (counts are CI-enforced against README.md)
 and the manifest). The full inventory tables and per-item purposes live in
 `CLAUDE.md`. Example anatomy and authoring rules: copy `examples/bmesh-gear/`;
 showcase conventions: `showcase/README.md`. The render look is specified

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, 64 total (+ gallery.json)
-showcase/<name>/               - Budget-conformance props, 74 pieces, each with a gallery `category` (sibling of examples/; see showcase/README.md § Categories)
+showcase/<name>/               - Budget-conformance props, 75 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>64 examples</strong> &nbsp;&bull;&nbsp; <strong>74 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>64 examples</strong> &nbsp;&bull;&nbsp; <strong>75 showcase pieces</strong>
 </p>
 
 <p align="center">
@@ -37,7 +37,7 @@
 
 ## Overview
 
-This repository ships **16 skills, 9 rules, 3 templates, 27 snippets, 64 examples, and 74 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, 64 examples, and 75 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>74 showcase pieces</strong> — click to expand the preview grid</summary>
+<summary><strong>75 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>
@@ -183,6 +183,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
   <a href="showcase/sundial/"><img src="showcase/sundial/preview.webp" width="24%" alt="Sundial: a garden sundial with a stepped stone plinth, a tapered octagonal granite column and cap, and a bronze dial plate with hour lines, a Roman-numeral chapter ring and a triangular gnomon, on a dark studio floor" /></a>
   <a href="showcase/mine-cart/"><img src="showcase/mine-cart/preview.webp" width="24%" alt="Mine cart: a rust-streaked riveted red steel tub on oak sills, four flanged iron wheels resting on two polished rails spiked to sleepers in grey ballast, on a dark studio floor" /></a>
   <a href="showcase/garden-gate/"><img src="showcase/garden-gate/preview.webp" width="24%" alt="Garden gate: a bow-topped gate of weathered oak boards standing ajar on black strap hinges between square posts on sandstone flags, on a dark studio floor" /></a>
+  <a href="showcase/ships-wheel/"><img src="showcase/ships-wheel/preview.webp" width="24%" alt="Ship's wheel: a varnished teak eight-spoke wheel with turned handles, a brass nave and a brass rim inlay, on a panelled teak pedestal with a stepped plinth, 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.
@@ -321,6 +322,8 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`garden-gate`](showcase/garden-gate/) — procedural ledged-and-braced garden gate on hook-and-band hinges through the same pipeline; every knuckle measured coaxial on its pin, both pins on one plumb axis, and the swing circle clearing the latch post. Falsifiers `--skip-decimate` exits 9, `--offset-knuckle` exits 17, `--lift-gate` exits 18, `--tilt-pintle` exits 19, `--tight-post` exits 20.
 
+[`ships-wheel`](showcase/ships-wheel/) — procedural eight-spoke ship's wheel on its pedestal, turned teak spokes and handles on a brass nave, through the same pipeline; nave concentric with the rim, every spoke and handle seated in the rim, spokes 45° apart. Falsifiers `--skip-decimate` exits 9, `--stray-vert` exits 15, `--lift-z` exits 16, `--offset-hub` exits 17, `--short-spoke` exits 18, `--skew-spoke` exits 19.
+
 </details>
 
 ## Examples

ROADMAP.md

@@ -146,7 +146,7 @@ Not committed; target list for the next content version. (v0.3.0 shipped the smo
 - ~~Mine cart on a rail segment as a game-prop showcase piece~~ **SHIPPED** as `showcase/mine-cart/` — riveted steel tub on four flanged wheels over 30 lb rails, spiked sleepers and ballast; every tread seated within −1.5..+0.5 mm of its railhead (`--float-wheel` exits 18), axles square (`--skew-axle` exits 19), flanges 3–10 mm clear of the railheads (`--wide-gauge` exits 20); `--skip-decimate` exits 9 on the LOD1 ratio band
 - ~~Hinged garden gate as a game-prop showcase piece~~ **SHIPPED** as `showcase/garden-gate/` — ledged-and-braced oak gate on hook-and-band hinges: knuckle axis on pin axis (0.000 mm, 0.600 mm clearance), knuckle seat on the hook, both pins plumb on one axis, swing circle clearing the latch post by 14.87 mm; `--skip-decimate` exits 9 on the LOD1 ratio band, `--offset-knuckle` 17, `--lift-gate` 18, `--tilt-pintle` 19, `--tight-post` 20
 - Mooring bollard with a coiled rope as a game-prop showcase piece — rope turns laid as stacked helices around the barrel: each turn resting on the one below (not interpenetrating, not floating), measured turn-to-turn off the mesh
-- Ship's wheel as a game-prop showcase piece — spokes and handles by exact radial repetition: equal angular spacing, every spoke end seated in the rim, hub/rim concentric, handles on the computed radius
+- ~~Ship's wheel as a game-prop showcase piece~~ **SHIPPED** as `showcase/ships-wheel/` — eight turned teak spokes and handles on a brass nave, laminated rim with a brass inlay, iron shaft in a bolted brass collar on a panelled pedestal; nave concentric with the rim and the shaft in its bore (`--offset-hub` exits 17), every spoke and handle seated 1–6 mm into the rim (`--short-spoke` exits 18), spokes 45° ± 0.05° apart with handles on their axes (`--skew-spoke` exits 19); `--skip-decimate` exits 9 on the LOD1 ratio band
 - Sawhorse pair carrying a plank as a game-prop showcase piece — splayed legs and a board spanning two supports: the plank's underside rests on both saddles within a band (a two-support span, not a single seat) and every foot lands on the floor
 - Tiered stone fountain as a game-prop showcase piece — concentric basins on a column: every basin coaxial, each upper basin's lip overhanging the one below by a stated band so the overflow line lands inside the next basin
 - Cannon on a wooden field carriage as a game-prop showcase piece — trunnions seated in the carriage's cap-square cradles: trunnion axis coaxial with both cradles and wheels resting on the ground at the axle's computed height

docs/gallery/anvil/index.html

@@ -45,7 +45,7 @@ <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 74 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 75 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 London-pattern forged anvil with a thick face block, tapered horn and broad flared foot on a hooped oak stand, a cross-peen hammer on the floor beside it.">
       <img src="../assets/anvil-hero.webp" alt="A London-pattern forged anvil with a thick face block, tapered horn and broad flared foot on a hooped oak stand, a cross-peen hammer on the floor beside it." width="1280" height="720" fetchpriority="high" />
     </button>
@@ -3571,7 +3571,7 @@ <h3><a class="stretch" 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 74 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 75 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">
     <div class="lightbox-bar"><button class="lightbox-close" id="lightboxNative" type="button" aria-pressed="false">Actual size</button><button class="lightbox-close" id="lightboxClose" type="button" autofocus>Close</button></div>

docs/gallery/apothecary-shelf/index.html

@@ -45,7 +45,7 @@ <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 74 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 75 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>
@@ -3420,7 +3420,7 @@ <h3><a class="stretch" 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 74 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 75 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">
     <div class="lightbox-bar"><button class="lightbox-close" id="lightboxNative" type="button" aria-pressed="false">Actual size</button><button class="lightbox-close" id="lightboxClose" type="button" autofocus>Close</button></div>

docs/gallery/archery-target/index.html

@@ -45,7 +45,7 @@ <h1>Archery Target</h1>
     <p>A procedural archery range target on a turf patch — a 1.10 m compressed-straw boss coiled from rope courses that show on its back and round its edge, bound with doubled jute twine drawn tight over the crests; an 80 cm ten-zone World Archery face in aged inks with ring lines, an X ring and a printed X, held by four target pins; a timber easel leaning it back 12° on toe skids with knee braces, a ledge with a stop lip on a bolted rail and gussets, a numbered butt board, a strap hinge pinned to a rear leg in a steel ferrule and foot, and a splay chain between eye bolts; five carbon arrows in the face with cresting, nocks and three vanes, one glancing into the straw edge, one snapped with its fletched half on the grass, and a leather quiver of arrows lying among grass tufts — 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="../cargo-loader/" aria-label="Previous showcase piece: cargo-loader"><span aria-hidden="true">&larr;</span> cargo-loader</a><span class="pager-pos hud">53 of 74 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../cactus-garden/" aria-label="Next showcase piece: cactus-garden">cactus-garden <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager" aria-label="Showcase pieces"><a rel="prev" href="../cargo-loader/" aria-label="Previous showcase piece: cargo-loader"><span aria-hidden="true">&larr;</span> cargo-loader</a><span class="pager-pos hud">53 of 75 showcase pieces<span class="pager-keys"> &middot; <kbd>&larr;</kbd><kbd>&rarr;</kbd></span></span><a rel="next" href="../cactus-garden/" aria-label="Next showcase piece: cactus-garden">cactus-garden <span aria-hidden="true">&rarr;</span></a></nav>
     <button class="detail-hero" id="heroZoom" type="button" aria-label="View full size: A straw archery boss with a gold, red, blue, black and white face and five arrows, leaning on a timber easel numbered 12, a quiver on the grass patch below.">
       <img src="../assets/archery-target-hero.webp" alt="A straw archery boss with a gold, red, blue, black and white face and five arrows, leaning on a timber easel numbered 12, a quiver on the grass patch below." width="1280" height="720" fetchpriority="high" />
     </button>
@@ -5266,7 +5266,7 @@ <h3><a class="stretch" href="../wooden-barrel/">Wooden Barrel</a></h3>
         </article>
       </div>
     </section>
-    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../cargo-loader/" aria-label="Previous showcase piece: cargo-loader"><span aria-hidden="true">&larr;</span> cargo-loader</a><span class="pager-pos hud">53 of 74 showcase pieces</span><a rel="next" href="../cactus-garden/" aria-label="Next showcase piece: cactus-garden">cactus-garden <span aria-hidden="true">&rarr;</span></a></nav>
+    <nav class="pager pager-foot" aria-label="Showcase pieces"><a rel="prev" href="../cargo-loader/" aria-label="Previous showcase piece: cargo-loader"><span aria-hidden="true">&larr;</span> cargo-loader</a><span class="pager-pos hud">53 of 75 showcase pieces</span><a rel="next" href="../cactus-garden/" aria-label="Next showcase piece: cactus-garden">cactus-garden <span aria-hidden="true">&rarr;</span></a></nav>
   </main>
   <dialog class="lightbox" id="lightbox" aria-label="Full-size render">
     <div class="lightbox-bar"><button class="lightbox-close" id="lightboxNative" type="button" aria-pressed="false">Actual size</button><button class="lightbox-close" id="lightboxClose" type="button" autofocus>Close</button></div>