feat(showcase): add motor-scooter (vehicles)

The third piece in the vehicles category: a 1960s Italian step-through
motor scooter, no brand names or badges, parked on its centre stand. A
pressed-steel tail lofted from superellipse sections with two bulbous side
cowls (narrower inboard so the tyre clears; chrome belt trims; six
graduated pressed louvres on the engine-side cowl); a floorboard with seven
rubber runner strips and chrome edge trims, pressed up into the tail's
front face and into the leg shield through two radiused fillets; a leg
shield pressed as one panel, convex in plan (edges swept 0.075 m back at
the foot, 0.135 m at the top), bulged at mid-height, its top arched up
into the headset round the column, its foot 32 mm deep in the floor,
rimmed in a rolled chrome trim, with a horn cast (fork crown to headset)
and chrome grille; a single-sided front end (column raked 26 deg, crown, fork leg,
trailing link, coil spring on a damper rod) under a crested mudguard; a
headset with headlamp, speedometer, collar, ribbed grips, levers and two
mirrors; a two-tone dual saddle (cream top, oxblood sides) with piping and
a grab strap; 10-inch split rims (two halves, five nuts, hub cap, finned
drum) in block-tread tyres; an alloy engine case with a finned cylinder,
header, black silencer, chrome tailpipe and kick-start; brake pedal,
luggage rack, tail lamp, blank plate; a centre stand on rubber feet.
Nine materials: pastel paint, chrome, rubber, oxblood vinyl, cream vinyl,
glass, tail lens, alloy, black enamel.

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):
- 45060 tris (band 44400-45700); LOD1 0.5000, LOD2 0.2200
- 9 materials: paint 7156, chrome 4638, rubber 3608, oxblood 1147,
  cream 297, glass 550, lens 188, alloy 4020, black 2292 faces
- UVs in 0..1, overlap 0; AABB 1.7901 x 0.7300 x 1.2435 m, zmin 0
- collider 1678 tris (ceiling 1850); bake FINISHED; glTF 3374040 B
- hygiene all 0, zero coplanar cross-shell pairs (first draft measured
  525: runner strips, rim nuts vs each other and the hub cap, rack cross
  bars, louvres; now staggered 0.3-0.4 mm, louvres graduated and laid on
  the cowl's latitude)
- supports: both tyres and both stand feet zmin 0
- wheel alignment: camber 0.000/0.000 deg, toe 0.000 deg (cap 0.3)
- steering: rake 26.000 deg, trail 0.0750 m (band 0.055-0.090), 0 mm off
  the contact's line (tol 2 mm)
- body mirror 0.000 mm (cap 0.5; engine side excluded by construction:
  louvres, engine, exhaust, fork are separate shells), tail 0.8624 m,
  saddle top 0.8068 m (tol 0.004)
- wheelbase 1.20000 m (tol 0.004)
- stance: 101.6 kg, mass centre 0.1284 m inside the tyres-and-stand
  support polygon (floor 0.080)
- one connected assembly of 105 shells
- shield seam: its foot 0.0320 m deep in the floorboard (band 0.020-0.040)
- 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
- --float-tyre -> rear tyre zmin 0.00400 -> 16
- --toe-wheel -> toe 2.5000 deg -> 17
- --steep-head -> rake 20.000 deg, trail 0.01683 m -> 18
- --odd-body -> mirror deviation 0.00695 m -> 19
- --short-wheelbase -> 1.18500 m -> 20
- --narrow-stand -> margin 0.0424 m -> 21
- --pop-speedo -> 2 components -> 22
- --lift-shield -> foot 4 mm above the floor (-0.00400 m) -> 23
Tris and AABB identical to the default under every falsifier; every
earlier budget green in each run. Three were re-aimed by fixing the model:
--odd-body first exited 15 (a rack rail riding past the tail's shoulder
lay in a bowed tail face's plane; the rails now follow the crown),
--narrow-stand exited 15 at +-0.035 m (the two soles came within coplanar
range; stops at +-0.060), --pop-speedo at 15 mm stayed seated (30 mm).

Render: render_hero.py wrote hero and preview. Framing fill x 0.603,
y 0.856, margins >= 0.056 (a tall vehicle with mirrors; y carries the
band). Asset-quality floors pass (edge90 0.039); a violation remaps to 24.

Asset sheet (docs/gallery/asset-sheets/motor-scooter.webp): not the
least-designed object in the lineup; the hydrant and the wheelbarrow are
plainer. Isolated it reads at once as a classic scooter: cowls, trims,
louvres, two-tone saddle, split rim, silencer, headset and mirrors. Weak
points: it is small in its panel and the mirror stalks are thin at sheet
scale. A review of the first hero found the leg shield read as a flat
plank standing apart from the floor and column; it was rebuilt as the
curved pressing above, with the seam budget and --lift-shield added.

Contact sheet: luma 0.2398 against calibration 0.2369-0.2428 (in band).
Stage 0.1906 against 0.1919-0.2517 (0.001 darker than the darkest).
Wedge warmth +0.1005 against -0.1440/+0.1052/+0.0921 (warm, in band).
Saturation 0.2334 against 0.1525-0.2367 (in band). Thumbnail legibility
good. The first lit draft measured luma 0.2708 and warmth -0.0123; relit
by lowering key, fill and rim and warming the wedge.

Also updated: README, CLAUDE.md and ROADMAP counts and entries (the
scooter added to the Vehicles sub-list, struck as shipped), the
asset_sheet.py SELECT row, catalog.json, plugin.json and the regenerated
gallery. build_gallery, check_site_links (103 pages, 0 failures),
check_falsifier_targets, check_exit_code_readme, check_engine_id,
check_gallery_images and the count check all pass.

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

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -185,6 +185,7 @@
     "showcase/hover-bike",
     "showcase/weight-rack",
     "showcase/boulder-cluster",
-    "showcase/floor-fan"
+    "showcase/floor-fan",
+    "showcase/motor-scooter"
   ]
 }

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, 47 pieces, each with a gallery `category` (sibling of examples/; see showcase/README.md § Categories)
+showcase/<name>/               - Budget-conformance props, 48 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>47 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>48 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 47 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 48 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>47 showcase pieces</strong> — click to expand the preview grid</summary>
+<summary><strong>48 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>
@@ -156,6 +156,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
   <a href="showcase/weight-rack/"><img src="showcase/weight-rack/preview.webp" width="24%" alt="Weight rack: a red half rack holding a barbell loaded with blue and yellow bumpers on J-hooks, plates on storage horns and two hex dumbbells, on a dark studio floor" /></a>
   <a href="showcase/boulder-cluster/"><img src="showcase/boulder-cluster/preview.webp" width="24%" alt="Boulder cluster: a speckled granite block, a banded sandstone boulder split in two and a slab resting on a smaller boulder, sunk in a grassy soil mound with pebbles and wildflowers, on a dark studio floor" /></a>
   <a href="showcase/floor-fan/"><img src="showcase/floor-fan/preview.webp" width="24%" alt="Floor fan: a sage-green 1950s pedestal fan with a chrome wire guard over four brass blades, its head turned on a tilt yoke, a telescoping column and a round cast base, its cord looped to a plug, on a dark studio floor" /></a>
+  <a href="showcase/motor-scooter/"><img src="showcase/motor-scooter/preview.webp" width="24%" alt="Motor scooter: a pastel sea-green 1960s step-through scooter with a two-tone cream and oxblood dual saddle, louvred side cowls, a curved chrome-trimmed leg shield, split-rim wheels and a black silencer, on its centre stand 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.
@@ -248,6 +249,8 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`floor-fan`](showcase/floor-fan/) — the third `household` piece: procedural 1950s oscillating pedestal fan (a hollow two-tier cast base on a rubber gasket with a rotary speed switch and badge, a telescoping column with a knurled height-lock collar, a strap yoke with a tilt knob, a slotted motor housing with an oscillation knob, a two-half wire guard of spokes and rings welded to clipped rim rings, four swept brass blades on a hub with a spinner nut, and a cord to a plug), whose rotor and head coaxial with the guard, spokes seated in their rim rings, plumb column on the base's axis, blade-tip clearance, equal blade spacing, tip-over angle and single connected assembly are recomputed from the mesh, through the same pipeline. Falsifiers `--offset-hub` exits 17, `--short-spoke` 18, `--lean-column` 19, `--long-blades` 20, `--skew-blade` 21, `--hollow-base` 22, `--loose-spinner` 23.
 
+[`motor-scooter`](showcase/motor-scooter/) — the third `vehicles` piece: procedural 1960s Italian step-through motor scooter (a pressed-steel tail with two bulbous side cowls, louvres on the engine side and chrome belt trims, a floorboard with runner strips pressed up into the tail and a leg shield convex in plan, arched into the headset and rimmed in chrome, with a horn cast and grille, a single-sided front end with a raked column, trailing link, coil spring and a crested mudguard, a headset carrying the headlamp, speedometer, grips, levers and mirrors, a two-tone piped dual saddle with a grab strap, 10-inch split rims in block-tread tyres, an alloy engine case with a finned cylinder, silencer and kick-start, a luggage rack, tail lamp and plate, and a centre stand), whose tyres and stand feet grounded, wheel axles level and parallel, steering trail, body mirror symmetry excluding the engine side, wheelbase, mass centre inside the support polygon, single connected assembly and the leg shield seated in the floorboard are recomputed from the mesh, through the same pipeline. Falsifiers `--float-tyre` exits 16, `--toe-wheel` 17, `--steep-head` 18, `--odd-body` 19, `--short-wheelbase` 20, `--narrow-stand` 21, `--pop-speedo` 22, `--lift-shield` 23.
+
 </details>
 
 ## Examples

ROADMAP.md

@@ -159,7 +159,7 @@ Not committed; target list for the next content version. (v0.3.0 shipped the smo
   - **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)~~ **SHIPPED** as `showcase/soccer-goal/` — 5 × 2 m youth goal, oval extrusion mitred and welded at the corners, cast brackets, foot connectors and hubs, sloped supports and a staked steel ground frame, sagging diamond-mesh net on a red head rope through 53 clips, turf patch with a goal line; `--float-bar` exits 16 on every ground bar bedded in the turf, `--short-support` 17 on the supports seated in their sockets, `--unclip-net` 18 on the head rope through every clip, `--wide-mouth` 19 on the clear mouth size, `--taut-net` 20 on the back panel's sag, while the envelope holds; tennis net on posts, ~~weight rack with plates and dumbbells~~ **SHIPPED** as `showcase/weight-rack/` — half rack of punched, numbered uprights on bolted, padded feet, J-hooks with UHMW saddles and spotter arms on pull pins, plate-storage horns, a loaded Olympic barbell (knurled shaft, bumpers with raised numerals, iron change plates, spring clips) and two hex dumbbells; `--float-foot` exits 16 on every pad and dumbbell head on the floor, `--offset-pin` 17 on the pins coaxial with their holes, `--float-bar` 18 on the bar seated in both saddles, `--hook-high` 19 on the bar level, `--gap-plate` 20 on the plates seated along their sleeves, `--odd-load` 21 on the balanced load, `--loose-horn` 22 on one connected rack, while the envelope holds; alternates bowling pins and ball, skateboard
   - **Nature:** ~~pine tree (trunk, tiered branch whorls)~~ **SHIPPED** as `showcase/pine-tree/` — buttressed trunk with surface roots, ten seeded whorls of limbs seated in the bark, faceted needled shoots, dead stubs and cones; `--float-branches` exits 17 on the branch seat, `--lean-crown` 19 on trunk plumb, `--bunch-whorls` 20 on whorl spacing, while the envelope holds; ~~boulder cluster~~ **SHIPPED** as `showcase/boulder-cluster/` — a speckled granite block, a banded sandstone boulder split in two with matching crack faces and bedding, and a sandstone slab resting on a smaller granite boulder, cut by cleavage planes with weathered bevels, with lichen crusts and moss cushions, sunk into a soil mound with grass tufts, pebbles and wildflowers; `--perch-boulder` exits 17 on every boulder sunk into the soil, `--float-slab` 18 on the slab seated on its support, `--perch-slab` 19 on its mass centre over its footprint, `--skew-half` 20 on the split halves matching, `--sunny-lichen` 21 on growth facing up or north, `--float-cover` 22 on the ground cover rooted in the soil, while the envelope holds; ~~fallen log with fungus~~ **SHIPPED** as `showcase/fallen-log/` — furrowed log on a bowed axis with peeled, galleried sapwood, a hollow saw-cut butt, a splintered top, broken stubs, moss cushions, three tiers of bracket fungi, and a soil mound with toadstools, ferns and fallen leaves; `--hump-ground` exits 17 on the log bedded along its length, `--float-fungi` 18 on the brackets rooted in the bark, `--tilt-ground` 19 on the mass centre over the contact patch, `--sunny-moss` 20 on moss facing up or into the shade, `--float-litter` 21 on the ground cover rooted in the soil, while the envelope holds; tree stump with mushrooms; alternates flowering shrub, cattail reeds
   - **Household:** ~~articulated desk lamp~~ **SHIPPED** as `showcase/desk-lamp/` — stepped cast base, parallelogram arm sections pinned through knuckle bosses, three springs hung on cross bars, domed shade with reflector, lamp, flex and plugged cable; `--offset-pin` exits 17 on the pins coaxial with their eyes, `--unhook-spring` 18 on the spring ends seated on their bars, `--hollow-base` 19 on the mass centre over the base footprint, while the envelope holds; ~~office chair (five-star base, casters)~~ **SHIPPED** as `showcase/office-chair/` — polished five-star base with ribbed spokes and swivelled twin-wheel casters, chrome gas lift in a telescoping cover, tilt mechanism with knob and levers, contoured seat with a piped welt, reclined mesh back with lumbar pad and headrest on an aluminium spine, height-adjustable T-arms; `--float-caster` exits 16 on every wheel on the floor, `--skew-spoke` 17 on the five-star spacing and plumb stems, `--offset-column` 18 on the gas lift coaxial with hub and socket, `--uneven-arms` 19 on mirrored level armrests, `--loose-wheel` 20 on one connected assembly, while the envelope holds; kitchen stool, mini fridge; alternates ~~floor fan~~ **SHIPPED** as `showcase/floor-fan/` — 1950s oscillating pedestal fan: hollow cast base on a gasket with a speed switch and badge, telescoping column with a height-lock collar, strap yoke with a tilt knob, slotted motor housing with an oscillation knob, two-half wire guard welded to clipped rim rings, four swept brass blades on a hub with a spinner nut, cord to a plug; `--offset-hub` exits 17 on the rotor coaxial with the guard, `--short-spoke` 18 on every spoke seated in its rim ring, `--lean-column` 19 on the column plumb and on the base's axis, `--long-blades` 20 on the blade-tip clearance band, `--skew-blade` 21 on equal blade spacing, `--hollow-base` 22 on the tip-over angle, `--loose-spinner` 23 on one connected assembly, while the envelope holds; laundry basket
-  - **Vehicles:** ~~quad drone~~ **SHIPPED** as `showcase/quad-drone/` — two-tone moulded shell with battery, GPS, grilles and visor, four folding arms hinged on pinned clevises, slotted motors with twisted two-blade props, rubber-footed skids, three-axis gimbal camera; `--float-foot` exits 16 on every foot grounded, `--unlock-arm` 17 on the motor axes on an exact X, `--long-blades` 18 on the prop-disc clearance, `--narrow-skids` 19 on the mass centre inside the landing footprint, `--drop-lens` 20 on one connected assembly, while the envelope holds; traffic cone and barrier set, ~~hover bike~~ **SHIPPED** as `showcase/hover-bike/` — sculpted two-tone fuselage with panel seams, intake grilles, tail vents and cooling fins, a stitched pleated saddle, clip-on bars with grips, levers and an emissive instrument cluster, a flyscreen and headlight pod, two exhaust nozzles, two ducted fans (airfoil shrouds, canted stator vanes, handed seven-blade rotors), booms with foot pegs, and two landing skids on struts; `--float-skid` exits 16 on both skids grounded, `--offset-hub` 17 on the hubs coaxial with their shrouds, `--long-blades` 18 on the blade-tip clearance band, `--odd-hull` 19 on the fuselage's mirror symmetry, `--skew-blade` 20 on equal blade spacing, `--narrow-skids` 21 on the mass centre inside the skids' contact polygon, `--pop-lens` 22 on one connected assembly, while the envelope holds; sci-fi cargo loader; alternates sci-fi supply crate
+  - **Vehicles:** ~~quad drone~~ **SHIPPED** as `showcase/quad-drone/` — two-tone moulded shell with battery, GPS, grilles and visor, four folding arms hinged on pinned clevises, slotted motors with twisted two-blade props, rubber-footed skids, three-axis gimbal camera; `--float-foot` exits 16 on every foot grounded, `--unlock-arm` 17 on the motor axes on an exact X, `--long-blades` 18 on the prop-disc clearance, `--narrow-skids` 19 on the mass centre inside the landing footprint, `--drop-lens` 20 on one connected assembly, while the envelope holds; traffic cone and barrier set, ~~hover bike~~ **SHIPPED** as `showcase/hover-bike/` — sculpted two-tone fuselage with panel seams, intake grilles, tail vents and cooling fins, a stitched pleated saddle, clip-on bars with grips, levers and an emissive instrument cluster, a flyscreen and headlight pod, two exhaust nozzles, two ducted fans (airfoil shrouds, canted stator vanes, handed seven-blade rotors), booms with foot pegs, and two landing skids on struts; `--float-skid` exits 16 on both skids grounded, `--offset-hub` 17 on the hubs coaxial with their shrouds, `--long-blades` 18 on the blade-tip clearance band, `--odd-hull` 19 on the fuselage's mirror symmetry, `--skew-blade` 20 on equal blade spacing, `--narrow-skids` 21 on the mass centre inside the skids' contact polygon, `--pop-lens` 22 on one connected assembly, while the envelope holds; sci-fi cargo loader; ~~motor scooter~~ **SHIPPED** as `showcase/motor-scooter/` — 1960s Italian step-through: pressed-steel tail with bulbous side cowls (louvres on the engine side), floorboard with runner strips pressed up into the tail and into a curved, chrome-rimmed leg shield with a horn cast, single-sided trailing-link front end with a crested mudguard, headset with headlamp, speedometer and mirrors, two-tone piped dual saddle, split-rim wheels in block-tread tyres, engine case, silencer, luggage rack and centre stand; `--float-tyre` exits 16 on both tyres and both stand feet grounded, `--toe-wheel` 17 on the axles level and parallel, `--steep-head` 18 on the steering trail, `--odd-body` 19 on the body's mirror symmetry, `--short-wheelbase` 20 on the wheelbase band, `--narrow-stand` 21 on the mass centre inside the support polygon, `--pop-speedo` 22 on one connected assembly, `--lift-shield` 23 on the leg shield seated in the floorboard, while the envelope holds; alternates sci-fi supply crate
 - `persistent` app-handler witness — handlers registered without `@bpy.app.handlers.persistent` are dropped by `wm.read_homefile`/file load while persistent ones survive; assert the registered-handler set before and after a reload (silent loss AI code hits)
 - Link vs append witness — `bpy.data.libraries.load(link=True)` yields a linked, non-editable datablock (`library` set, `is_editable` False) while append yields a local copy; write a temp .blend with `bpy.data.libraries.write`, then assert both paths
 - Orphan purge witness — `bpy.data.orphans_purge(do_recursive=...)` removes exactly the zero-user datablocks computed independently beforehand, and `bpy.data.batch_remove` removes a given set in one call (counts closed-form)