cac86f024b
- Add 15 Tier 5 pipeline co-sim tests (cross-layer): decimator, MTI, Doppler, DC notch, CFAR, and full-chain golden match - Add 4 SoftwareFPGA tests (test_v7): golden fixture integrity, process_chirps wiring validation against manual chain - Wire compare_doppler.py into run_regression.sh with 3 scenarios (stationary, moving, two_targets) replacing single unvalidated run - Harden _load_npy to raise on missing files; expand sentinel check to all 14 golden artifacts - DC notch test verifies both zero and pass-through bins Test counts: 172 python + 55 cross-layer + 21 MCU + 29 FPGA = 277 total