Multi-Port Touchstone (.s4p..s32p) Passivity/Causality Eigenvalue Auditor & IBIS Golden-Check X-Ray

Deterministic Touchstone 1.1/2.0 N-port scattering-matrix SVD passivity test (sigma_max(S(omega)) <= 1), generalized Hilbert Kramers-Kronig causality residual & convex singular-value clipping projector + IBIS V-I/V-T clamp checker engine (.s2p, .s4p, .s8p, .ibs) built for Keysight ADS, Siemens HyperLynx, Cadence Sigrity, LTspice / QSPICE — zero-upload ephemeral Wasm RAM execution.