A frozen K/M/C finite-element robustness audit for qualitative Zeeman-like, Stark-like, and 21 cm/hyperfine-like response patterns in the MMU v6.3 framework. This OSF package documents a structural WIP simulation, not an empirical prediction. The audit tests whether one fixed K/M/C orbital FEM package can produce stable orbital-like mode families and qualitative perturbation responses without retuning K, M, or C. The internal state is restricted to w = (w2, w3, w4), with w1 used only as projected readout. The reported run sweeps three finite source models — three-cell compact, tetrahedral symmetric, and spherical one-cell — over grid resolutions n = 17, 21, 25 at L = 8.0. All nine declared source/mesh cases pass the base orbital, Zeeman-like, Stark-like, and hyperfine-like structural gates. The package includes the single-file Python runner, generated reports, methods and limitations files, CSV outputs, publication plots, and orbital visualizations. The result supports a finite-source K/M/C response-class interpretation. It does not prove MMU, hydrogen, the physical proton, QED/QCD replacement, or absolute Zeeman, Stark, or 21 cm frequencies.
Jurgen Wollbold (2026) studied this question.