Add PiPNN: high-performance alternative index builder (7.6-10x faster graph build)#856

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SeliMeli wants to merge 54 commits intomicrosoft:mainfrom

Commits on Mar 18, 2026

PiPNN: batched HashPrune + dynamic BLAS threading + cleanup

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PiPNN: profiling-guided optimizations

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PiPNN: add 1-bit scalar quantization support

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PiPNN: optimize 1-bit quantized path with cache-friendly binary ops

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PiPNN: inline Hamming loops, revert failed pre-sort experiment

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PiPNN: reuse kNN buffer across points, use u32 indices

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PiPNN: production-ready integration into DiskANN build pipeline

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Commits on Mar 19, 2026

Commits on Mar 23, 2026

Commits on Mar 30, 2026

Commits on Mar 31, 2026

Commits on Apr 1, 2026