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/027_surgical_sync_runs.sql

@@ -18,3 +18,6 @@ CREATE INDEX IF NOT EXISTS idx_sync_runs_mode_started
     ON sync_runs(mode, started_at DESC);
 CREATE INDEX IF NOT EXISTS idx_sync_runs_status_phase_started
     ON sync_runs(status, phase, started_at DESC);
+
+INSERT INTO schema_version (version, applied_at, description)
+VALUES (27, strftime('%s', 'now') * 1000, '027_surgical_sync_runs');