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

README.md

@@ -250,6 +250,31 @@ which is gitignored) onto the `cloth`/`pants` albedos; `build` bakes them into t
 `.glb` and regenerates the procedural normal + packed ORM maps. `palette` writes
 `assets/textures/npc/palette.json` using `model_pipeline.dominant_colors`.
 
+### Blender asset library (staged, not yet loaded by the game)
+
+`tools/blender_assets.py` models a larger library procedurally in Blender for the
+v0.6.0 integration: **8 skinned NPC characters** (casual, jacket, coat, hi-vis vest,
+dress, hoodie, firefighter, guard), each a drop-in for `npc_base.glb` (same bones,
+joint positions and tint slots); **18 gear pieces** authored at head/hand/back/chest
+attach points (caps, hood, helmet, backpack, SCBA tank, lanyard, phone, cup,
+clipboard, umbrella, camera, sign, flashlight, wand, radio, …); and **20 props**
+(octagonal bollard and bin, slatted bench, hydrant, news box, planters, street lamp,
+street and palm trees, A-frame sign, wall lantern, cone, crowd barrier, stanchion,
+handrail, podium, double door, marquee, sedan). Contract and integration notes:
+[`docs/blender-assets.md`](docs/blender-assets.md).
+
+| Characters | Props |
+| --- | --- |
+| ![characters](docs/blender_previews/sheet_npc.jpg) | ![props](docs/blender_previews/sheet_props.jpg) |
+
+```bash
+flatpak run org.blender.Blender --background --python "$PWD/tools/blender_assets.py" -- build
+flatpak run org.blender.Blender --background --python "$PWD/tools/blender_assets.py" -- render
+python3 tools/blender_assets.py sheet   # docs/blender_previews/sheet_*.jpg
+python3 tools/blender_assets.py audit   # no Blender needed
+godot --headless --path . --import
+```
+
 ### Confirmed game assets
 
 Everything below is audited and shipped in the game; development-only outputs
@@ -445,6 +470,7 @@ The full arc42-style architecture documentation lives in [`docs/architecture.md`
 - [`docs/architecture.md`](docs/architecture.md) — arc42-style architecture documentation.
 - [`docs/adr/`](docs/adr/) — Architecture Decision Records.
 - [`docs/plan-graphics-v0.6.md`](docs/plan-graphics-v0.6.md) — Graphics-quality plan: Blender-authored NPC characters.
+- [`docs/blender-assets.md`](docs/blender-assets.md) — Blender asset library: characters, gear, props, attach points.
 
 ## Development Status