Decision: SQLite (Option A) — existing schema, CRUD, row mapping,
and chunk_manifest column are already built but not wired into mount.
8-day plan to transform mount from O(N×origin_latency) to O(N×SQLite_read):
1. Database bulk load + manifest CRUD methods
2. Rewrite run_mount() with DB-load vs first-mount-scan paths
3. Persist chunk manifests via ManifestCached event
4. Wire tantivy + PatternStore + CollectionStore into mount
5. Background delta sync (origin vs DB reconciliation)
6. Shutdown WAL checkpoint
7-8. Integration testing + buffer
Alexander