3-Phase Energy-Meter IC (ADE7878 / ATM90E32) Phase-Swap Detective & CT Phase-Lag Calibrator

Deterministic 48-state signed permutation group (S_3 phase assignment x Z_2^3 CT polarity)phasor-residual minimizer + inductive load PF=0.5 angular error delta_phi = arccos(P_meas / (V*I)) - 60° engine (.json, .csv, .yaml) built for Analog Devices (ADE7878/ADE9000), Microchip (ATM90E32/36), Shelly Pro 3EM, ESPHome — zero-upload ephemeral Wasm RAM execution.

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