Stevenic / vectra / 26368506539

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Stevenic/perf improvements (#124)

* perf improvements

* perf and bug fixes

 array.

  3. Batch chunk removal in deleteDocument (src/LocalDocumentIndex.ts:180)
  Added a new public LocalIndex.deleteItems(ids: Iterable<string>) that does a single filter pass. deleteDocument now uses it instead of looping deleteItem
  per chunk, taking M-chunk deletion from O(N·M) to O(N).

  4. Parallel external metadata loads in queryItems (src/LocalIndex.ts:354)
  Top-K metadata file reads now run concurrently via Promise.all.

  Tests: 7 new tests (deleteItems batch behavior + shallow snapshot semantics) plus one existing test updated to stub the new code path. 130/130 pass, lint
  and build clean.

  Docs: docs/changelog.md and docs/api-reference.md updated.

  Fix: addItemToUpdate now includes norm: newItem.norm in the upsert replacement (src/LocalIndex.ts:495). Previously, upserting a new vector kept the old
  norm, which would skew cosine-similarity rankings until the next insertItem of the same id (which isn't allowed — unique=true throws on duplicate). So in
  practice the stale norm could persist indefinitely on any upsertItem that changed the vector.

  Test: new case in beginUpdate shallow snapshot proves the norm is recomputed (insert [3,4] → norm 5, upsert [6,8] → norm 10).

* version bump

* bug fixes and better coverage

947 of 1036 branches covered (91.41%)

Branch coverage included in aggregate %.

118 of 121 new or added lines in 5 files covered. (97.52%)

1905 of 1936 relevant lines covered (98.4%)

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