Use WaveformConfig for live range/velocity conversion in RadarDataWorker
and add headless AST-based regression checks in test_v7.py.
Before: RadarDataWorker._run_host_dsp used RadarSettings.velocity_resolution
(default 1.0 in models.py:113), while ReplayWorker used WaveformConfig
(~5.343 m/s/bin). Live GUI under-reported velocity by factor ~5.34x.
Fix: local WaveformConfig() in _run_host_dsp, mirroring ReplayWorker
pattern. Doppler center derived from frame shape, matching processing.py:520.
Test: TestLiveReplayPhysicalUnitsParity in test_v7.py uses ast.parse on
workers.py (no v7.workers import, headless-CI-safe despite PyQt6 dep)
and asserts AST Call/Attribute/BinOp nodes for both RadarDataWorker
and ReplayWorker paths.
f895c0244c