W6 of the oak task list. scopes::math is a pure, unit-tested core
(histogram binning, waveform min/max envelopes, vectorscope chroma
projection, meter segment math, peak-hold decay) feeding three canvas
widgets - Histogram, Waveform, Vectorscope - generic over LumaDataSource /
ChromaDataSource traits the host implements over its frame buffers, plus an
AudioLevelMeter over AudioMeterDataSource with lit segments and a peak
marker. examples/scopes.rs drives all four from mock signals. 96 widget
tests pass.
Mike-Solar
bdb1684de7