feat(storage): HNSW approximate nearest neighbor index - #50
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…ings - Add HNSWIndex with proper multi-level graph construction, greedy entry-point descent, and heap-based best-first layer search - Add BuildHNSWIndex/SearchHNSW to the Storage interface, with per-model indexes held on the Store and built on demand - Add embeddings_hnsw table for persisting the graph alongside embeddings - Transaction stores report HNSW ops as unsupported (index is rebuilt outside the transaction) - Update mocks and add TestHNSWIndex covering ranking, ordering, and per-model isolation
This was referenced Aug 15, 2026
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Phase 1 SQLite hardening (4/5). Merges after #49.
HNSWIndex: multi-level graph with greedy entry-point descent, heap-based best-first layer search, neighbor pruning (efConstruction=200, m=16, efSearch=50)BuildHNSWIndex/SearchHNSWon the Storage interface; per-model indexes held on the Store, built on demandembeddings_hnswtable persists the graph (also added via this branch's schema so it works standalone)TestHNSWIndexcovers ranking, ordering, and per-model isolationNote: includes
storage/lock.gore-added for compilation since it branched from main ahead of #47; expected to reconcile when #47 lands first.Merge order: after pragma/metrics (#49).