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Measurement accountability for Gazepoint physiology

This tranche adds four conservative diagnostics.

compare_hrv_prv_devices() reports ICC(A,1), Lin CCC and Bland–Altman agreement per derived metric, carrying ECG/PPG and sensor-site provenance rather than producing a global interchangeability flag.

scr_responsivity_sensitivity() preserves the conventional SCR non-responder flag while estimating a Beta-Binomial response probability and retaining low-reactive participants for model-based sensitivity analysis.

physiology_validation_ladder() separates acquisition QC, analytical QC, construct evidence, within-person evidence and held-out-person generalization. Population/generalization claims require the final stage to pass.

ppg_topology_features() is opt-in and experimental. It summarizes H0 persistence lifetimes on a delay embedding as a structural waveform descriptor, never as a direct physiological surrogate, and carries a participant-grouped validation guardrail.

Methodological motivation: DOI 10.1186/s12872-026-06556-4, DOI 10.1016/j.biopsycho.2026.109336, DOI 10.3389/fnrgo.2026.1911259, and DOI 10.1016/j.measurement.2026.122168.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.