SAM3D high quality reruns

Pfpxc5M7b0: SAM3D bottle re-mesh (init_frame 48), Phase E rebake

2026-05-18: -Pfpxc5M7b0 sauce bottle reprocessed with init_frame=83 (cylinder shape, was flat plate)

D-track refresh after A100 SAM3D recovery — -Pfpxc5M7b0_257.7_264.2

Replace samples/ with 21-clip Step 1 test batch (no SAM3D, no 6DoF)

Refresh dataset: 48 trim-reviewed clips, manual SAM3 prompts, full descriptions in scene.json