Release Version v1.1.0 · sunhailin-Leo/hnswlib-to-go

What's Changed

Synced hnswlib C++ headers to latest nmslib/hnswlib master
New hnswlib/stop_condition.h header from upstream
NewWithReplaceDeleted() — create index with replace-deleted support
AddPointWithReplace() — add vector reusing deleted slots
Free() — explicit memory release for HNSW index
Nil-safety checks for all public methods (return zero values instead of panicking)
Comprehensive unit tests: 19 test functions covering all space types (L2, IP, Cosine)
Performance benchmarks: 7 benchmark functions (AddPoint, SearchKNN, BatchOps, SaveLoad)
Multi-platform Makefile with portable, opt, bench, lint targets
Cross-compilation targets: build-linux-amd64, build-linux-arm64, build-darwin-amd64, build-darwin-arm64, build-windows-amd64
Windows support via MinGW-w64 (conditional CGO LDFLAGS, uint64_t types)
GitHub Actions CI: Linux, macOS, Windows matrix with Go 1.21–1.26
CHANGELOG.md with full version history

Upgraded hnswlib from v0.7.0 to latest master
All C bridge types changed from unsigned long int to uint64_t for cross-platform safety (Windows LLP64 compatibility)
SearchKNN now uses sync.Pool to reuse C-type buffers — allocs reduced 50% (4 → 2), L2 search ~12% faster
SearchBatchKNN uses lock-free per-index writes instead of mutex — allocs reduced 49% (412 → 211)
normalizeVector optimized to in-place modification (no slice return/copy)
Removed unnecessary runtime.GC() call from Free()
go.mod bumped to Go 1.21

Fixed 3 upstream bugs in hnswalg.h: internal_id → internalId variable name
Fixed UpdateBatchPoints condition bug (&& → || for parameter validation)
Fixed errcheck lint warnings in test files

Benchmark	ns/op	B/op	allocs/op
AddPoint (L2)	1,805,974	512	1
AddPoint (Cosine)	1,476,631	512	1
SearchKNN (L2, top-10)	119,831	96	2
SearchKNN (Cosine, top-10)	89,467	96	2
SearchBatchKNN (100×4)	4,231,052	15,650	211
SaveLoad (5000 vectors)	16,149,372	50	1

Full Changelog: https://github.com/sunhailin-Leo/hnswlib-to-go/blob/v1.1.0/CHANGELOG.md