Add .cargo/config.toml to enable native CPU features (AVX2, SSE4.2, etc.)
for maximum performance during compilation. This allows rustc and
dependencies to use SIMD instructions and other CPU optimizations.
This should reduce CPU usage of the DSP backend by allowing:
- Vectorized floating-point operations
- Better compiler optimizations for complex number math
- SIMD acceleration in dependencies like num-complex
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
