Stage the Blender character/gear/prop library

Commit the finished generator output from the parallel Blender pass:
8 skinned NPC variants, 18 gear pieces, and 20 props under
assets/models/blender/, editable sources (gdignored), manifest, review sheets,
and the integration notes in docs/blender-assets.md.

- audit: all 46 assets clean (characters 3,788-4,640 tris, under 6000/4000)
- tests: Python manifest/audit contract and Godot import/bone/slot/ground checks
- docs: README library section, architecture/plan references, TODO Phase 3.5
  status, MEMORY integration rules
- .gitignore: per-asset preview PNGs, extracted GLB textures, blend1 backups

Nothing in the game loads the library yet; integration follows." && git log --oneline -1

MEMORY.md

@@ -129,15 +129,20 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
   flat plane, so avoidance (not a baked mesh) routes guests around props. Placements live in
   `PROP_PLACEMENTS` with `placement_problems()` validation; variants come from `variant_for(index)`.
   `smoke_props.gd` must be windowed because the guard reads captured-mouse input.
-- **Blender asset library (v0.6.0, in progress):** `tools/blender_assets.py` generates
-  `assets/models/blender/{npc,npc_gear,props}/` plus `manifest.json`, `docs/blender_previews/`,
-  and (when finished) `docs/blender-assets.md`. Contract: 8 character variants (same bones/slots
-  as `npc_base`), 18 gear pieces in attach-point space (head/hand/back/chest), 22 props; the first
-  nine replace current furniture/lamps/trees/cone, the rest are new dressing. Treat the manifest
-  as the source of truth and run `python3 tools/blender_assets.py audit`/`sheet` before wiring.
-  At the time of writing only `npc_casual` existed (7,756 tris / 5,616 verts, above the current
-  6,000/4,000 character budget) — reconcile the budget before integration. Don't edit the
-  generator while its Blender process is running.
+- **Blender asset library (v0.6.0, built + audited 2026-11-01, not integrated):**
+  `tools/blender_assets.py` (`build`/`render` in Blender; `audit`/`sheet`/`list` stdlib) writes
+  `assets/models/blender/{npc,npc_gear,props}/*.glb`, `manifest.json` (integration source of
+  truth), sources in `assets/models/blender_src/` (`.gdignore`d), and review sheets
+  `docs/blender_previews/sheet_*.jpg` (per-asset PNG renders are gitignored). 8 characters, 18
+  gear, 20 props; notes in `docs/blender-assets.md`. Characters are drop-in for `npc_base`
+  (same mesh node name, bones at the same rest positions, five tint slots) and stay under the
+  6000/4000 budget only because of body decimation (0.36) + `smart_project` at 80°: glTF vertex
+  count includes UV-seam splits, so extra beveled detail quickly breaks 4000.
+  **Gotchas:** `bisect_plane` and thin bevels leave zero-area triangles (Godot warns "non-finite
+  normal in LOD generation"); `_clean()` + a weld after bisect fix it, and the audit rejects them.
+  Fixed-colour detail materials carry a 4×4 texture because `_apply_outfit_materials()` sets
+  `albedo_color = WHITE` on unknown slots. Cycles CPU render ≈ 3 s/asset; Godot import of the
+  library is clean.
 - **Prop pipeline (done):** audit enforces 400 tris / 600 verts, ground contact, UV range, no
   degenerate tris, one material. `capture_prop_gallery.gd` writes `10-prop-gallery.png` (3x2 studio
   line-up, back row on a platform) and the `prop_gallery` catalogue entry compares it.