Separated the asset pipeline from the cascade work. T-1049/T-1050 assume a sprite-centric catalog; direction is 3D objects (Trellis .glb) in-world with textures as the only flattened content. Held for re-scope. Cascade track (T-1044/T-1047) continues. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>