Character ages and Phase 8 checkpoint (interiors)

AGENTS.md

@@ -131,8 +131,24 @@ cmake --build build --target demoLuaSceneScript # Demo: game-mode inline scene/p
 cmake --build build --target demoSceneSwitchingExtra # Demo: scene switching with CellGrid interior
 cmake --build build --target demoSokoban      # Demo: forklift sokoban activity (vehicle + crates + quest HUD)
 cmake --build build --target demoTaxi         # Demo: taxi driver (procedural town, sedans, NPC traffic, fare chain)
+cmake --build build --target characters-all   # All adult/baby/child/teenager/elder character assets
+cmake --build build --target character-assets-check # Validate age catalogs/LODs/resource tree
 ```
 
+### Parallel asset builds
+
+Blender 3.6 batch jobs are not safe to run concurrently (shared user
+config/addon state and shared build files).  Every Blender invocation in
+the CMake pipeline goes through `${BLENDER_LOCKED}`, which is
+`flock -x ${BLENDER_LOCK} <blender>`, so `cmake --build build -jN` is
+safe: only one Blender job runs at a time while CMake copies, compiles
+and validates in parallel.  `flock` must be installed (configure fails
+otherwise).  The default lock is per build tree
+(`<build-dir>/blender-assets.lock`); if two build trees are built at the
+same time, configure them with the same lock file, for example
+`-DBLENDER_LOCK=/tmp/world2-blender-assets.lock`.  New custom commands
+must use `${BLENDER_LOCKED}`, never `${BLENDER}` directly.
+
 ### Build Outputs
 - `build/Game` - Main game executable (legacy)
 - `build/Editor` - World editor executable (legacy)
@@ -375,6 +391,12 @@ JPH::BodyID body = physics->createBody(shape, 1.0f, position, rotation,
      `<name>.vehicle.json` scene entity (contract:
      `assets/blender/vehicles/CAR_MODELING.md`)
    - `import_vrm.py` - VRM character import
+   - `characters/generate_age_blends.py` + `characters/agegen/` - one-shot
+     adult → age-band seed converter (rig scaling, mesh/shape-key
+     deformation, garment/hair conversion, animation retargeting; contract:
+     `assets/blender/characters/AGES-PLAN.md`)
+   - `characters/validate_age_assets.py` - structural validation of the
+     generated age catalogs/LODs/resource tree
 3. **Build**: CMake processes assets during build
 4. **Runtime**: Assets loaded from `resources.cfg` paths