- 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
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