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.

docs/adr/0013-blender-authored-npc-characters.md

@@ -1,6 +1,6 @@
 # ADR-0013: Blender-authored NPC characters and baked materials
 
-- **Status:** Proposed
+- **Status:** Accepted (v0.6.0)
 - **Date:** 2026-11-01
 
 ## Context

docs/architecture.md

@@ -76,7 +76,7 @@ The player interacts with NPCs, venue entrances, access artifacts, equipment, st
 - `ReputationEvaluator` converts incidents and shift outcomes into performance feedback.
 - `CrowdSystem` models queues, attention, congestion, and public reaction.
 - `ShiftReview` presents decisions, consequences, and improvement opportunities.
-- `SurfaceMaterials` (`src/game/materials.gd`) holds the surface profiles, glass/emissive recipes, and the environment tune-up (tonemapping, glow, fog, grading) that the phase lighting applies.
+- `SurfaceMaterials` (`src/game/materials.gd`) holds the surface profiles, textured albedo/normal recipes, baked-AO wiring, glass/emissive recipes, and the environment tune-up (tonemapping, glow, fog, grading) that the phase lighting applies.
 - `WorldBuilder` assembles the procedural venue and instantiates the generated prop models from `assets/models/generated/` with a procedural fallback.
 - `tools/model_pipeline.py` builds and audits the street-prop `.glb` models and packs their colour atlases.
 - `tools/npc_pipeline.py` builds and audits the skinned NPC base model (`assets/models/generated/npc_base.glb`) and its per-slot material maps, with an optional AI fabric override (ADR-0013).

docs/plan-graphics-v0.6.md

@@ -233,7 +233,7 @@ Props are grounded except `wall_lantern` and `marquee`; both may be emissive.
    asset is absent); CI still runs the Godot import and headless suite.
 
 
-### Phase 4 — Environment and lighting lift (after NPCs land)
+### Phase 4 — Environment and lighting lift (after NPCs land) ✅
 
 1. **Baked AO on props:** use the Phase 3.5 Blender prop replacements
    (`street_lamp`, `street_tree`, `bench`, …) and bake AO into their
@@ -242,9 +242,9 @@ Props are grounded except `wall_lantern` and `marquee`; both may be emissive.
 2. **Higher-resolution environment textures:** regenerate brick/concrete/asphalt
    through `asset_pipeline.py` with normal maps, keeping the current UV scales;
    use the same sRGB/albedo + packed ORM discipline as the library assets.
-3. **Evaluate a desktop-only Forward+ preset** (SSAO/SSIL/volumetrics) while the
-   Web export preset keeps `thread_support=false` and GL Compatibility. Decide
-   explicitly in an ADR addendum; do not silently change the renderer.
+3. **Evaluate a desktop-only Forward+ preset** — done: it boots on the desktop Vulkan
+driver, but the renderer is project-wide and the Web preset must stay GL
+Compatibility. v0.6.0 keeps Compatibility; a desktop-only override is deferred.
 4. Regenerate `docs/screenshots/` with `capture_screenshots.gd`, then run
    `screen_designs.py compare` and `judge` as the regression gate, plus
    `blender_assets.py sheet` for the character/gear/prop library.