Cycling .FIT Critical Power & Skiba W'-Balance Anaerobic Matchbook Analyzer

Deterministic 3-parameter Critical Power hyperbolic fit + Skiba (2015) differential W'_bal depletion & dynamic tau_W' recovery ODE integration engine (.fit, .tcx, .csv) built for Garmin, Wahoo, Intervals.icu, GoldenCheetah — zero-upload ephemeral Wasm RAM execution.

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