Holds Translucency / Luminosity / Diffuse / SurfOpacity / NeedsUvRepeat /
DisableFog keyed by (gfxObjId, surfaceIdx). Populated at extraction time,
queried by the draw dispatcher. ConcurrentDictionary because mesh
extraction happens on background workers.
No fork patches required — keeps WB's MeshBatchData pristine.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>