- Drop flat list as primary storage; derive uploaded/rejected IDs from by_person
(single source of truth). Legacy flat lists in existing files still read for
backward compat. Removes dual-representation sync hazard.
- Add begin_batch/flush_batch: per-person upload loop now does 1 os.replace
instead of N (one per mark_uploaded call). Benefit on slow storage.
- reset_all_people(): RESET_PERSON=* is now O(1) disk writes instead of O(P^2).
- blur_score_from_image inlines cv2.Laplacian directly, removing assess_quality
call overhead and decoupling from the full quality pipeline.
flan
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