fix(migrations): add schema_version inserts to migrations 022-027

Defense-in-depth: The migration framework already handles missing
inserts via INSERT OR REPLACE (db.rs:174), but adding explicit
inserts to .sql files ensures consistency and makes migrations
self-documenting.

Migrations affected:
- 022_notes_query_index
- 024_note_documents  
- 025_note_dirty_backfill
- 026_scoring_indexes
- 027_surgical_sync_runs

migrations/024_note_documents.sql

@@ -151,3 +151,6 @@ END;
 
 DROP TABLE IF EXISTS _doc_labels_backup;
 DROP TABLE IF EXISTS _doc_paths_backup;
+
+INSERT INTO schema_version (version, applied_at, description)
+VALUES (24, strftime('%s', 'now') * 1000, '024_note_documents');