Boat Hatch, Camper Roof & Heavy Lid Gas-Strut Pivot & Newton Force Solver

Deterministic Moment equilibrium ∑M_hinge(θ) = W·L_cog·cos(θ) - n·F_gas(s(θ))·d_perp(θ) with closed over-center negative moment & stroke margin check engine (.dxf, .pdf, .svg) built for Stabilus, Suspa, Bansbach, Hafele — zero-upload ephemeral Wasm RAM execution.

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