Integrate the Blender character, gear and prop library

NpcAvatar
- select one of 8 library character variants by role/seed (with npc_base and the
  procedural rig as fallbacks), keep Rig/Head and the existing bone animation
- tint only skin/cloth/pants/accessory/hair; fixed detail materials keep their
  colour, npc_vest keeps its hi-vis vest, firefighter/guard use dark uniform tints
- attach caps, hoods, helmets, backpacks, SCBA tanks, lanyards and hand items at
  the documented head/back/chest/hand points (primitive fallbacks retained)

WorldBuilder
- prefer assets/models/blender/props/ for the six replacements and the new
  street dressing (street lamp/tree, palms, planters, A-frame, cone, barrier,
  stanchion, podium, handrail, wall lantern, double door, marquee, sedan)
- fit the same colliders/navigation obstacles and keep the placement validator;
  collect library emissives (bulbs, marquee face, wall lanterns, door LED, sedan
  lights) for set_night_mode()
- add a library triangle counter + 60k budget check (current ~27,986); toggle
  prop gallery to the library models; fix the marquee label placement

Tests/smoke
- character selection/gear attach/fixed-material tint tests; library prop load,
  emissive and triangle-budget tests; smoke_props routes a guest around a
  stanchion in open sidewalk (the old bench route is now crowded by trees)
- headless 222/222, Python 68/68, all smokes pass, compare 11 good / 0 bad

Docs: TODO Phase 3.5 moved to DONE, README/architecture/blender-assets/plan
describe the integrated runtime, MEMORY records the integration rules.

DONE.md

@@ -830,3 +830,33 @@ Completed 2026-11-01 (post-v0.5.0, pre-v0.6.0). Headless suite **209/209**.
       `-basis.z`), so noticed NPCs still look at the guard with the fixed facing.
 - [x] Added `test_yaw_faces_the_movement_direction`; recaptured the targeting screenshot to
       confirm NPCs now show their back only when walking away.
+
+## Blender Asset Library Integration
+
+Completed 2026-11-01 (v0.6.0 work). Headless **222/222**, Python **68/68**, all windowed/headless
+smokes pass, `compare` **11 good / 0 bad**. AO/ORM baking remains in Phase 4.
+
+- [x] Committed the audited library (8 characters, 18 gear, 20 props), generator, `.blend`
+      sources, manifest, review sheets, and integration notes.
+- [x] `NpcAvatar` selects a character variant by role/seed (`npc_casual`, `npc_jacket`,
+      `npc_coat`, `npc_vest`, `npc_dress`, `npc_hoodie`, `npc_firefighter`) with `npc_base` and
+      the procedural rig as fallbacks; the choice is recorded in `character_model`.
+- [x] Only the five contract slots (`skin`, `cloth`, `pants`, `accessory`, `hair`) are tinted;
+      fixed detail materials keep their authored colour. `npc_vest` keeps its fixed hi-vis vest,
+      and firefighter/guard use dark uniform tints.
+- [x] Library gear replaces the procedural accessories and hand items at the documented
+      `head` / `back` / `chest` / `hand` attach points (cap, hood, helmet, backpack, SCBA tank,
+      lanyard, phone, cup, clipboard, umbrella, camera, sign, flashlight, wand, radio), with the
+      primitive path retained as fallback.
+- [x] `WorldBuilder` loads the Blender replacements (`bollard`, `bench`, `trash_bin`,
+      `planter_box`, `newspaper_box`, `fire_hydrant`, `street_lamp`, `street_tree`,
+      `traffic_cone`) and places the new dressing (`palm_tree`, `round_planter`, `a_frame_sign`,
+      `crowd_barrier`, `stanchion`, `security_podium`, `handrail`,
+      `double_door`, `marquee`, `sedan`, `wall_lantern`) with colliders/avoidance and placement
+      validation.
+- [x] Library emissive surfaces (lamp bulbs, marquee bulbs/sign face, wall lanterns, door LED,
+      sedan lights) are collected and driven by `set_night_mode()`.
+- [x] Added a library triangle counter and 60k triangle budget check; the current set is
+      ~27,986 triangles. NPC budget smoke: 16 avatars = 112 meshes at ~6.9 ms.
+- [x] Recaptured the README/catalogue screenshots (including the prop gallery from the library
+      models) and fixed the marquee text placement.