AIS Target Relative-Motion Vector, CPA/TCPA Window & COLREGs Course-Change Simulator

Deterministic 2D relative velocity vector V_rel = V_target - V_own closest-point-of-approach d_CPA = |R x V_rel| / |V_rel| & COLREGs Rule 15/17 sector logic engine (.nmea, .csv, .json) built for Vesper Cortex, Furuno, Raymarine, Digital Yacht — zero-upload ephemeral Wasm RAM execution.