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Add compact staged and nibble nested-LUT layouts with adaptive ADC. Provide NEON and AVX-512 kernels under dynamic SIMD dispatch.
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Adds compact nested-LUT4 and nested-LUT7 layouts for RaBitQ, supporting progressive HNSW navigation and full-code refinement.
Introduces dynamically dispatched integer ADC kernels using ARM NEON dot-product and AVX-512 VNNI, with portable fallbacks for lower SIMD levels.