Object to 3D (clean splat + printable STL, 100% local)

Turn a video orbiting a single object into two deliverables, entirely on-device:

1. a clean Gaussian splat of just the object (background, table and floaters removed) that you can navigate in the browser, and
2. a watertight, millimeter-scaled STL (plus a colored GLB) ready to slice and 3D-print.

The capture → splat half reuses the proven video-to-splat pipeline; this skill adds the two object-specific stages that follow training.