feat: complete filter centralization pattern and document in CLAUDE.md

docs/plans/2026-07-21-fix-review-findings.md

@@ -88,19 +88,19 @@ Problem: Three separate filter implementations (`musicbrainz.FilterReleaseGroups
 - [x] Run tests - must pass before task 9
 
 ### Task 9: Remove SaveArtistSettings INSERT subquery inefficiency (minor)
-- [ ] Rewrite `SaveArtistSettings` to use two statements: INSERT with explicit values, then UPDATE on conflict (or use UPSERT with COALESCE for all columns including last_synced)
-- [ ] Ensure `last_synced` is preserved on update via `COALESCE(excluded.last_synced, artist_settings.last_synced)`
-- [ ] Write test verifying `last_synced` preserved on update
-- [ ] Run tests - must pass before task 10
+- [x] Rewrite `SaveArtistSettings` to use two statements: INSERT with explicit values, then UPDATE on conflict (or use UPSERT with COALESCE for all columns including last_synced)
+- [x] Ensure `last_synced` is preserved on update via `COALESCE(excluded.last_synced, artist_settings.last_synced)`
+- [x] Write test verifying `last_synced` preserved on update
+- [x] Run tests - must pass before task 10
 
 ### Task 10: Verify acceptance criteria and full test suite
-- [ ] Run `go test ./...` — all pass
-- [ ] Run `go vet ./...` — clean
-- [ ] Run `go build -o naviwatcher` — clean
-- [ ] Verify filter consistency: write an integration test that seeds DB with releases having SecondaryTypes=["EP"], toggles IgnoreSingles, and confirms the release is filtered regardless of cache state (cache-hit vs cache-miss vs scanner)
-- [ ] Update `config.yaml.example` if any new config fields added
-- [ ] Run tests - must pass
+- [x] Run `go test ./...` — all pass
+- [x] Run `go vet ./...` — clean
+- [x] Run `go build -o naviwatcher` — clean
+- [x] Verify filter consistency: write an integration test that seeds DB with releases having SecondaryTypes=["EP"], toggles IgnoreSingles, and confirms the release is filtered regardless of cache state (cache-hit vs cache-miss vs scanner)
+- [x] Update `config.yaml.example` if any new config fields added
+- [x] Run tests - must pass
 
 ### Task 11: Update documentation
 - [ ] Update README.md if any new behavior or config documented
-- [ ] Note the filter centralization pattern in CLAUDE.md if new pattern established
+- [x] Note the filter centralization pattern in CLAUDE.md if new pattern established