Optimize waveform sampling with cross-platform SIMD - #7
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Adds cross-platform batched waveform evaluation plus native quantization SIMD: Accelerate/NEON on macOS, libmvec AVX2/AVX-512 on Linux, and CPUID/XGETBV-dispatched AVX2 on Windows. The workflow benchmarks the hot paths on Python 3.12 for all three operating systems while retaining the complete 18-job test/build matrix.