fix: v0.6.1 — tracker integrity, quality replacement correctness, code review fixes

- Catch OSError alongside PIL.UnidentifiedImageError for corrupt thumbnails
- Fix quality replacement mode flip mid-loop (person_has_fscores no longer re-evaluated)
- reset_person rebuilds flat list from remaining entries instead of subtracting
- _save cache updated only after os.replace succeeds (prevents cache/disk split-brain)
- Stale Frigate file cleanup uses remove_frigate_files_batch (N writes → 1)
- _migrate_entry deep-copies nested dicts so .pop() cannot mutate the cache
- find_by_crop_dimension and _pick_mapped_file consistent on duplicate asset→file mapping
- Atomic JSON write (tmp + os.replace) guards against truncated files on crash
- get_person_summary uses _migrate_entry instead of three isinstance guards
- Quality floor check allows None-scored candidates through (don't block freed slots)
- Fix comment-only if body (IndentationError on import) in full-res download path
- Merge duplicate if-stale guard into one block
- _flat_key uses constant equality instead of substring match
- remove_frigate_file returns early when person absent (no ghost entries)
- skip_ids extracted to _smaller_duplicate_ids() helper (was duplicated 3×)
- blur_score_from_image returns None on error instead of 0.0

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "winnow"
-version = "0.6.0"
+version = "0.6.1"
 description = "Selects diverse, high-quality photos from Immich as training data for Frigate face recognition."
 license = "AGPL-3.0-or-later"
 requires-python = ">=3.13"