This article presents a methodological framework for auditing phenomenological compatibility models in fundamental physics. Instead of claiming that the MMU v6. 5 model is proven, the paper uses MMU v6. 5 as a case study to demonstrate how a speculative model can be made reproducible, falsifiable, and claim controlled. The study focuses on Yb King plot and clock residuals. Internal model parameters are frozen before external comparison, and a negative control package is processed through the same pipeline. The candidate package remains compatible under a disclosed U1 U2 U3 uncertainty accounting framework, while the negative control remains rejected. The U3 uncertainty block is further separated into nuclear deformation, next to leading residual structure, and electronic coefficient uncertainty. The main contribution is not a new proof of fundamental physics, but an audit architecture that separates compatibility from validation, prevents post hoc retuning, and explicitly blocks overinterpretation. Piw1 remains an open readout proof obligation, and no canon promotion is claimed. All supporting Python programs, reports, CSV files, manifests, and checksums are provided in the supplementary evidence archive to enable independent review and reproduction.
Jurgen Wollbold (Thu,) studied this question.