HNSW: copy-on-write snapshots (snapshot series 01-10)#982

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kei-nan wants to merge 10 commits into

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kei-nan:snapshot/10-repair-cow-safety

Commits on Jun 11, 2026

HNSW snapshot 01: block deep-copy primitive + design docs

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HNSW snapshot 02: rooted copy-on-write block storage (RootedCowStore<T>)

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HNSW snapshot 03: immutable snapshot handle + capture API

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HNSW snapshot 04: COW-aware insert path (snapshots survive concurrent writes)

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HNSW snapshot 05: lock-free KNN over a captured snapshot

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HNSW snapshot 06: snapshot-backed batch iterator (plain HNSW, opt-in)

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HNSW snapshot 07: tiered cursor captures-then-releases the main lock

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HNSW snapshot 08: concurrent-writer safety (lock-free block COW + atomic metadata)

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HNSW snapshot 09: swap-side reclaim horizon

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HNSW snapshot 10: repair COW-safety — run graph repair under live snapshots
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