Studio Acoustic Quadratic-Residue (QRD) & 2D Skyline Diffuser Cut-Sheet Compiler

Deterministic Schroeder quadratic residue sequence s(n) = (n² + m²) mod N -> well depth d_n = (s_n · c) / (2 · N · f_0) avoiding specular lobing engine (.dxf, .pdf, .stl) built for Vicoustic, RPG Diffusor Systems, Genelec, Festool — zero-upload ephemeral Wasm RAM execution.