Long-Range FPV Li-Ion Voltage-Sag & Headwind Point-of-No-Return Planner

Deterministic Groundspeed wind-triangle power asymmetry + nonlinear Ragone Li-Ion discharge curve V_term(SoC) - I_return * R_internal(SoC, T) engine (.json, .csv, .gpx) built for Molicel, INAV, DJI FPV, Flywoo Explorer — zero-upload ephemeral Wasm RAM execution.