Add software-based CAM retrieval benchmark to compare retrieval quality
and speed against hardware simulation. Includes experiment documentation
with noise sweep analysis on CIFAR-10/100 datasets.
- Add sw_retrieval_benchmark.py for software Hamming distance Top-K retrieval
- Add test_sw_retrieval_benchmark.py with unit tests for dataset loading and metrics
- Add experiment doc (sw_hw_cam_retrieval_benchmark.md) comparing software vs hardware
- Document noise sweep impact on retrieval quality at various WRITE_NOISE_RATE values
