perf: Optimize arm64 & macos grep & general unindexed grep#566
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Vectorize bigram byte normalization (AVX2 on x86_64, auto-vectorized scalar elsewhere). Route grep through a P-core-sized, QoS-pinned rayon pool to avoid E-core drag and VFS-lock contention on asymmetric chips. Grow grep chunk size geometrically when the bigram prefilter is weak to bound rayon barrier count on large unindexed candidate sets.
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