Full experiment record: 14-case battery for the prototype gate, the MgAl2O4 partial-inversion demo, and the template-independence audit showing the corrupted Co3O4 tight-matches a broken pymatgen from_spacegroup Fd-3m construction at u~0.24.
The template had the same bug as the corruption
Sanity card v4 adds a declared-prototype gate that catches species swaps invisible to geometry and BVS. Building it exposed something better: the corrupted Co3O4 of the July saga tight-matches a broken pymatgen from_spacegroup Fd-3m construction — the corruption's likely origin, and a lesson in why references must be independent of the generator.