Fix SIGILL on pre-AVX x86_64: function-level target attributes + runtime CPU detection#307

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asg017:mainfrom

stumpylog:fix/302-simd-dispatch

Commits on Jun 11, 2026

Fix micro benchmark build: add vendor and root include paths
stumpylog
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Fix AVX/AVX2 SIMD dispatch: use target attributes and runtime CPU detection
stumpylog
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Add simd_dispatch benchmark for AVX2 distance dispatch paths
stumpylog
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