feat: stage 2 real CAD conveyor, hybrid physics drops, mobile policy (WIP)

- CAD pipeline: conveer.FCStd -> FreeCAD headless -> conveyor-web.glb
  (555KB Draco, 42 named nodes) integrated into main scene; gates and
  rollers animated from domain state
- Domain-driven adapter sorterVisualState.ts; per-SKU visual physics
  profiles (VISUAL_PHYSICS_ESTIMATE)
- Hybrid Rapier physics: kinematic belt travel -> dynamic drop handoff
  -> verified freeze; shared collider layout (physicsWorldLayout) used
  by runtime and headless validation sim (physicsDropSim + 13 tests)
- Gravity chutes / open roll-cage front redesign (drop tuning in progress:
  4/7 routes verified headless)
- Premium industrial visual: PBR, ACES, PCFSoft shadows, Lightformer env,
  UI cleanup behind ?debug=1
- Mobile capability policy: SVG fallback / Mobile Low / full tiers,
  Telegram WebView forced to SVG, e2e stubs for weak devices
- Performance benchmarks cad-light/physics/full pass; stage2 artifacts

tsc clean. Physics drop validation for 3 SKU routes still in progress.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -27,9 +27,11 @@
     "perf:replay-stability": "node scripts/replay-stability.mjs"
   },
   "dependencies": {
+    "@dimforge/rapier3d-compat": "^0.19.3",
     "@react-three/drei": "^10.7.7",
     "@react-three/fiber": "^9.6.1",
     "@react-three/postprocessing": "^3.0.4",
+    "@react-three/rapier": "^2.2.0",
     "@vitejs/plugin-react": "latest",
     "postprocessing": "^6.39.4",
     "react": "latest",
@@ -40,6 +42,9 @@
     "vite": "latest"
   },
   "devDependencies": {
+    "@gltf-transform/cli": "^4.4.2",
+    "@gltf-transform/core": "^4.4.2",
+    "@gltf-transform/functions": "^4.4.2",
     "@playwright/test": "^1.61.1",
     "@types/node": "^26.1.0",
     "@types/react": "^19.2.17",