Heavy Trailer Ramp & Overhead Door Torsion-Spring Counterbalance Matcher

Deterministic Cosine gravitational torque M_g(θ)=m·g·L_c·cos θ matched against helical torsion stiffness k_θ = E·d⁴/(64·D·N_a) with initial wind θ_0 least-squares fit engine (.pdf, .dxf, .csv) built for Century Spring, Lee Spring, Hormann, Knott — zero-upload ephemeral Wasm RAM execution.