Lathe Change-Gear Train Exact Ratio Solver & Missing-Gear .STL Generator

Deterministic Continued-fraction Diophantine rational approximation (A·C)/(B·D) = P_target/P_lead subject to center-distance triangle inequality on quadrant slot engine (.stl, .step, .pdf) built for Myford, South Bend, Weiler, Optimum — zero-upload ephemeral Wasm RAM execution.

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