Shot quality gate

Video generation is the expensive step - 247 s for one native-1080p clip on this machine, measured - and it faithfully animates whatever is wrong in its first frame. Gate frames with a second pair of eyes that did not write the prompt, on a different model from the one that did.

Workflow

1. Gate every frame against the approved product hero still and the storyboard's must_show:

   cinefoundry qa --project <id> --shot 1 --frame projects/<id>/frames/shot_001.png \
     --ref projects/<id>/refs/product.png --expect "the product upright on dark stone with its label readable"