Spring Rate From a Photo: Wire, Coils, Free Length to Exact N/mm

Deterministic Helix Fourier Profiler + Active-Coil Counter + Hookean Solver k=Gd^4/(8D^3 Na) engine (.jpg, .png, .dng) built for LEE SPRING, ASSOCIATED SPRING, CENTURY SPRING — zero-upload ephemeral Wasm RAM execution.

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