Design captions for your delivery crop, not your master crop

Placing video captions in a bottom band at y-center 0.9 of a 4:5 master silently breaks any 1:1 center-crop export - the crop ends at (H-2*pad) and the entire caption band falls outside. Check every text elements y-range against ALL export aspect ratios before rendering, or skip cropping exports entirely when the platform (X supports 4:5 vertical natively) plays the master aspect. Also: after enough patch-cycles on a generated video, stop spot-checking - run one independent full-checklist QA pass (dense frame extraction + audio cues vs the accumulated requirement list) before delivering.