37-arch: parametric walls, doors, windows and stairs (R3)

[AlexZ005]

Roadmap 37 R3 (P1, release 1.27): parametric architecture primitives.

What

• Add ▸ Architecture: Wall, Wall with door / windows / door + windows, Door, Double door, Window, Casement window, Stairs (straight, L, U, spiral).
• src/lib/arch/archGeometry.js (three only): build specs in GEOMETRY_PARAMS (the 21-C1 Terrain precedent). The existing geometry message, the 'geometry' history kind and userData.geometryParams carry them; there is no new wire type. cleanParams clamps every param at the wire boundary. fromArgs maps /create numbers to variants.
• Inspector: every parameter is editable. ParamSpec.show hides rows that don't apply. Geometry rows now follow external edits (a peer's edit or an undo); they used to stay stale.
• Doors and casements open on the 33 functional-behaviour runtime. arch/archParts.js rebuilds leaves and sashes idempotently on every scene poke, so restores, duplicates and syncs never double them. Registration goes through animatedImports.registerProceduralBehavior, which has no file bytes. The open/shut state replicates via the existing behavior message, and late joiners get it on the getanim reply.
• Colliders: walls and stairs use a trimesh (36 X2), a window uses a box, and a door uses the 33 frame slabs plus a kinematic leaf.
• 1 m grid: a wall's origin is its start end. Opening centres sit on half metres, and Add-menu placement rounds to whole metres.

Proof

• vitest archGeometry 37/37, including real-rapier checks, each with a counterfactual:
  • a ball rolls through a wall's doorway, and a wall without a door stops it;
  • the walker climbs the stair with the app's autostep, and a block of the same height stops it.
• e2e arch-primitives 39/39 (two peers + a late joiner, self-hosted signaling). Counterfactuals:
  • without the old-part removal, duplicates and rebuilds double the leaf;
  • without the getanim reply, the joiner's door stays shut.
• svelte-check 318/47 (baseline); build green.
• Screenshots in lanes-30/after-37/37-arch/ (dark + light).

Owed on device

Quest: door click/proximity feel, walking the stairs. A VR radial "Build" ring is not added (Add menu only).

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