Piano String Inharmonicity B-Coefficient & Custom Stretch Tuner

Deterministic Stiff-String Partial Regression `fn = n*f0*sqrt(1 + B*n^2)` over 12 Partials engine (.wav, mic) built for Steinway & Sons, Yamaha, Kawai, Bösendorfer — zero-upload ephemeral Wasm RAM execution.

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