Piano String Inharmonicity B-Coefficient & Railsback Stretch Solver

Deterministic Partial peak tracking → inharmonicity fit f_n=n f0 sqrt(1+B n^2) → multi-string false-beat beat detection → pinblock slip from exponential transient decay break. engine (.wav, .csv, mic) built for Steinway, Yamaha, Kawai, Bösendorfer — zero-upload ephemeral Wasm RAM execution.

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