Battery EIS Nyquist Spectrum (.csv/.dta) Randles-Warburg Equivalent-Circuit Fitter

Deterministic Lin-KK Kramers-Kronig validity test + complex nonlinear least-squares Levenberg-Marquardt fit of R0 + (R_sei||CPE1) + (R_ct+Z_Warburg)||CPE2 engine (.csv, .dta, .mpt, .txt) built for Gamry Instruments, BioLogic, Metrohm Autolab, Hioki — zero-upload ephemeral Wasm RAM execution.

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