Deterministic Planar slider-crank four-bar kinematics: stroke S = sqrt((A^2+B^2) + 2AB*cos(theta)) - sqrt(A^2+B^2) + instantaneous mechanical advantage dS/dtheta engine (.svg, .dxf, .pdf, .json) built for NICE, FAAC, BFT, Somfy — zero-upload ephemeral Wasm RAM execution.
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