Lane C: round-3 GLB hero-prop validation (useGLB path)
Validated Lane E's 9 fitting GLBs in real rooms. 5 good, now live behind useGLB (wire_shelf, clothes_rack, bookshelf, cube_shelf_wide, work_table); record_crate broken (won't load) + counter too long/no-till fall back to primitive. Report: docs/LANES/LANE_C_GLB_VALIDATION.md.
glb.js: real-metre scale clamped to footprint, per-kind yaw for Z-major assets (+90deg) per manifest facing convention, manifest.localBase for offline validation, awaitable upgrades. interiors.js: room.glbReady. interior_test.html: GLB toggle.
Soak useGLB on (50 rooms): throws 0, pathFail 0, detFail 0, leakGeo 0, leakTex 0, worst 10.5ms, 256 upgrades. qa.sh --strict green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
fe40ea7d0a