feat: add grindstone showcase piece

Stone wheel on a timber A-frame with iron axle, hubs, and crank through the shipped bake/LOD/collider/Unity glTF pipeline. --skip-decimate exits 9 on LOD1.

Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -153,6 +153,7 @@
     "showcase/wheelbarrow",
     "showcase/anvil",
     "showcase/water-trough",
-    "showcase/hitching-post"
+    "showcase/hitching-post",
+    "showcase/grindstone"
   ]
 }

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, 59
-examples, and 16 showcase pieces (counts are CI-enforced against README.md)
+examples, and 17 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, 59 total (+ gallery.json)
-showcase/<name>/               - Budget-conformance props, 16 pieces (sibling of examples/; see showcase/README.md)
+showcase/<name>/               - Budget-conformance props, 17 pieces (sibling of examples/; see showcase/README.md)
 scripts/build_gallery.py       - Regenerates docs/gallery/ from examples/gallery.json + showcase/gallery.json
 scripts/site/                  - Vendored landing-page build (Jinja2)
 docs/gallery/                  - Committed generated gallery pages + hero renders

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>59 examples</strong> &nbsp;&bull;&nbsp; <strong>16 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>59 examples</strong> &nbsp;&bull;&nbsp; <strong>17 showcase pieces</strong>
 </p>
 
 <p align="center">
@@ -37,7 +37,7 @@
 
 ## Overview
 
-This repository ships **16 skills, 9 rules, 3 templates, 27 snippets, 59 examples, and 16 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, 59 examples, and 17 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 (Cursor, Claude Code, any MCP-capable client) when working on Blender add-ons, geometry nodes scripts, batch pipelines, or animation tooling. There is no build step. Edit the markdown and Python files directly.
 
@@ -91,6 +91,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 <a href="showcase/anvil/"><img src="showcase/anvil/preview.webp" alt="Anvil: a London-pattern anvil on a hooped timber stump on a dark studio floor" /></a>
 <a href="showcase/water-trough/"><img src="showcase/water-trough/preview.webp" alt="Water trough: a staved wooden trough on trestle legs with iron straps on a dark studio floor" /></a>
 <a href="showcase/hitching-post/"><img src="showcase/hitching-post/preview.webp" alt="Hitching post: a square timber post with a pyramidal cap, cross-arm, iron bands, and two hitching rings on a dark studio floor" /></a>
+<a href="showcase/grindstone/"><img src="showcase/grindstone/preview.webp" alt="Grindstone: a stone wheel on a timber A-frame with an iron axle, hubs, crank, and tray on a dark studio floor" /></a>
 
 [`shipping-crate`](showcase/shipping-crate/) — procedural crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets. Falsifier `--skip-decimate` exits 9.
 
@@ -124,6 +125,8 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`hitching-post`](showcase/hitching-post/) — procedural timber hitching post with a cross-arm and iron rings through the same pipeline. Falsifier `--skip-decimate` exits 9.
 
+[`grindstone`](showcase/grindstone/) — procedural grindstone on a timber trestle with iron axle and crank through the same pipeline. Falsifier `--skip-decimate` exits 9.
+
 ## Examples
 
 Runnable, smoke-gated demos live in [`examples/`](examples/) — each is executed headless on

ROADMAP.md

@@ -120,7 +120,9 @@ Not committed; target list for the next content version. (v0.3.0 shipped the smo
 - ~~Blacksmith anvil on a timber stump as a game-prop showcase piece~~ **SHIPPED** as `showcase/anvil/` — London-pattern horn, face, heel, waist, hooped stump; `--skip-decimate` exits 9 on the LOD1 ratio band
 - ~~Staved wooden water trough on a stand as a game-prop showcase piece~~ **SHIPPED** as `showcase/water-trough/` — U-staves, end boards, iron straps, trestle legs; `--skip-decimate` exits 9 on the LOD1 ratio band
 - ~~Hitching post with iron ring as a game-prop showcase piece~~ **SHIPPED** as `showcase/hitching-post/` — square post, pyramidal cap, cross-arm, iron shoe, bands, two rings; `--skip-decimate` exits 9 on the LOD1 ratio band
-- Grindstone on a timber trestle as a game-prop showcase piece
+- ~~Grindstone on a timber trestle as a game-prop showcase piece~~ **SHIPPED** as `showcase/grindstone/` — stone wheel, A-frame trestle, iron axle, hubs, crank; `--skip-decimate` exits 9 on the LOD1 ratio band
+- Cast-iron village hand pump as a game-prop showcase piece
+- Timber fingerboard signpost as a game-prop showcase piece
 - ~~Small modular kit showcase on recognizable geometry (`modular-kit-snap` contract)~~ **SHIPPED** as `showcase/fence-kit/` — tiling post-and-rail section (AABB X is the tile width; does not re-witness the snap contract); `--skip-decimate` exits 9 on the LOD1 ratio band
 
 - ~~Custom ID-property delete witness~~ **SHIPPED** as `examples/cross-version-property-delete/` — IDs built via `bpy.data.objects.new` (not `active_object`); `property_unset` is TypeError and leaves the key; `del` removes it on 4.5 LTS and 5.x