VFX cleanup and compositing

Cleanup is a patch of real pixels laid over the problem, moving with the surface under it. Keep three things apart in every comp: the Plate (the original, never edited), the Repair (the patch, and only the patch), and the Holdout (anything in front that must survive, restored on top).

Build in a duplicate: ae_duplicate_comp {"comp": "Shot", "name": "Shot CLEAN"}.

Classify the shot first

Two questions decide it, not size: is the background behind the target ever seen, and what in front of it must survive?