Luthier Nut-Slot Filing Depth, 1st-Fret Clearance & Open-Chord Sharpness Guard

Deterministic 1st-fret stretch-induced pitch error delta_cents(h_nut) minimization + circular fingerboard radius tangent feeler-shim stack solver engine (.pdf, .json, .csv) built for Hosco, StewMac, Graph Tech TUSQ, Jescar — zero-upload ephemeral Wasm RAM execution.

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