Bake library AO and lift environment textures

Phase 4 of the v0.6.0 graphics plan:

- tools/bake_ao.py bakes 256² AO maps for every Blender character/gear/prop
  (Cycles, existing UVs) next to each GLB; Materials.apply_ao() wires the red
  channel into character slots, gear, and props. Compatibility has no SSAO.
- Regenerated brick/concrete/asphalt at 1024² with OpenRouter, derived tangent
  normal maps via tools/make_normal_maps.py, and wired them through
  SurfaceMaterials.textured() without changing UV scales.
- Evaluated Forward+: boots on desktop Vulkan, but the renderer is project-wide
  and Web must stay GL Compatibility; v0.6.0 keeps Compatibility (decision in
  MEMORY/plan). A desktop-only override is deferred.
- Recaptured screenshots; compare 11 good / 0 bad. Fixed marquee text alignment.
- Tests: baked AO maps exist for all 46 assets; prop/character AO material
  checks; headless 222/222, Python 69/69, all smokes pass.
- Version 0.6.0; ADR-0013 accepted; README/architecture/blender-assets/plan and
  TODO/DONE updated.

README.md

@@ -35,7 +35,7 @@ The central design goal is simple:
 > Downloads are public (no sign-in required) since the host's instance-wide
 > `REQUIRE_SIGNIN_VIEW` was disabled on 2026-10-31.
 >
-> **Latest: v0.5.0** — articulated NPC characters with LOD and idle behaviour, plus movement feel, gamepad support, and key remapping.
+> **Latest: v0.6.0** — Blender-authored character/gear/prop library with baked AO, higher-resolution environment textures, and phase-driven library props.
 > Releases are built automatically when a `vX.Y.Z` tag is pushed
 > (see [`docs/RELEASING.md`](docs/RELEASING.md)); manual builds use
 > `./tools/build_releases.sh`. Installer/AppImage packaging runs in the same pipeline
@@ -512,11 +512,12 @@ Implemented so far:
 - Prop collision and placement (v0.4.0): every prop fits a static collider from its mesh bounds and publishes a navigation obstacle, so the guard and guests cannot walk through benches, bins, or bollards; placements are grouped into zones with a validator, and deterministic variants add rotation, scale, and small clutter
 - Prop atlas (v0.3.1): `tools/model_pipeline.py` packs each prop's palette into one power-of-two colour atlas plus a metallic/roughness atlas and emits a single material with per-vertex UVs, so a prop is one draw material rather than one per part; `audit` enforces the contract
 - Generated prop models (v0.3.0 work): `tools/model_pipeline.py` builds bollards, benches, bins, planters, newspaper boxes and a hydrant as `.glb` props with per-part materials, loaded by `WorldBuilder` with a procedural fallback; the optional AI concept step (`model_pipeline.py concept`) supplies per-prop colour palettes
+- Environment pass (v0.6.0): 1024² brick/concrete/asphalt with derived tangent normal maps, 256² baked AO maps for every Blender character/gear/prop, and library props whose bulbs/LEDs/sign faces follow the day/night phase
 - NPC characters + library (v0.6.0): `NpcAvatar` loads one of 8 Blender-authored skinned variants (role/seed selected) with five tintable material slots, `Rig/Head` focus anchor, and attach-point gear; `npc_base.glb` and the procedural rig remain fallbacks. `tools/blender_assets.py` builds/audits the character, gear, and 20-prop library; `WorldBuilder` loads the replacements and new street dressing (lamp, trees, palms, planters, barriers, podium, doors, marquee, sedan, handrail) with colliders, navigation obstacles, and phase-driven emissives
 - Web build: `build/gig-line-web-<version>.zip` (Godot's non-threaded web template, no COOP/COEP headers needed) built by `tools/build_releases.sh` and published with the desktop artifacts; serve the unzipped folder from any static host
 - Aim-free selection pass (v0.3.0 work, [ADR-0011](docs/adr/0011-aim-free-selection-and-precision-walk.md)): the focus cone ranks candidates by angle then distance, `Tab` and the mouse wheel cycle nearby people nearest-first and pin the selection, right click clears focus with a short re-acquire grace, the HUD reports how many people are in the ring, and holding `Shift` walks at half speed for close work
 
-Not yet implemented: AO/ORM baking for the library props and the higher-resolution environment textures/Forward+ evaluation in [`docs/plan-graphics-v0.6.md`](docs/plan-graphics-v0.6.md), live 3D body-camera replay, editor-based GUT integration, and crowd performance profiling/LOD (see `TODO.md`).
+Not yet implemented: a desktop-only Forward+ preset (the renderer stays GL Compatibility for Web parity), live 3D body-camera replay, editor-based GUT integration, and crowd performance profiling/LOD (see `TODO.md`).
 
 ### Smoke Test Checklist