Compute PI and RI metrics#20
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Closes #19.
Adds optional per-beat waveforms from
mean_wave()viareturn_valid_beats=True, plus PI, RI, and velocity helpers that use those aligned beats. Defaultmean_wave()behaviour matchesdevelopbranch, the flag only addsvalid_beatsfor metric calculation.Functions
mean_wave(..., return_valid_beats=False)— when True, also returnsvalid_beats(quality-filtered, aligned beats).compute_psv_edv(valid_beats)— per-beat and mean PSV, EDV, TAMV.compute_pi(valid_beats)— per-beat and mean PI: (PSV − EDV) / TAMV.compute_ri(valid_beats)— per-beat and mean RI: (PSV − EDV) / PSV.