Sail Reefing Crossover Moment & CE-to-CLR Weather-Helm Balancer

Deterministic Polygon centroid area-weighted Center of Effort vs underwater foil CLR lead-percentage + heeling-induced yaw moment coupling engine (.json, .csv) built for North Sails, Quantum Sails, Elvstrom, Jefa Steering — zero-upload ephemeral Wasm RAM execution.

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