v2.4.6

Fixed

• PolyGraph's createVectorIndex constructor hook was typed as
  (onChange) => VectorIndex, so HNSWIndex and
  @0xx0lostcause0xx0/polypack-native's NativeVectorIndex/NativeHnswIndex
  — the entire point of the hook — failed to type-check under tsc --strict
  despite working at runtime, because VectorIndex's private fields give it
  a nominal type brand. Introduced a structural VectorIndexLike interface
  (now exported from the package root) that VectorIndex and HNSWIndex
  both implement, and retyped PolyGraph.vectors/createVectorIndex
  against it.
• MemoryAdapter's maxNodes cap was not actually LRU: applyChanges and
  bulkPutNodes re-put an existing node via a raw Map.set(), which does
  not move an existing key to the end of a JS Map's iteration order (only
  putNode's delete-then-set did). Since PolyGraph.flush()/save()
  prefer applyChanges when available, a frequently-updated node could
  still be evicted as if untouched. Both paths now route through the same
  touch-then-set helper as putNode.

Documentation

• README, docs/API.md, and per-package docs (python/README.md,
  crates/polypack-core/README.md, packages/node-native/README.md)
  updated to cover all three distribution channels (npm, PyPI's
  polypack-db, crates.io's polypack-core) and to describe recent
  additions (addNodes, adaptive compaction, secondary indexes,
  createVectorIndex, HNSWIndex, markVectorDirty, VectorIndex.hydrate,
  MemoryAdapter's eviction behavior).
• Added missing JSDoc/rustdoc/docstrings across the TypeScript, Rust, and
  Python public API surfaces, and merged three duplicate/leftover doc
  comments found on SyncClient, SyncServer, and MemoryTransport.