Under-Deck Marine Autopilot Linear/Hydraulic Ram Stroke, Tiller-Arm Radius & Hard-Over Sizer

Deterministic Slider-crank kinematics (stroke S = 2 * R_tiller * sin(theta_max)) + cosine thrust efficiency at hard-over & ISO 11592 hard-over time check engine (.json, .dxf, .pdf) built for Raymarine Evolution, B&G NAC-3, Garmin Reactor, Lecomble & Schmitt — zero-upload ephemeral Wasm RAM execution.

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