Goldilocks mMACE+MLP magnetism classifier

A frozen mMACE foundation model's pooled structure embedding, fed through a small MLP, predicting whether a periodic material's DFT ground state is magnetic. Trained on MatPES PBE; test ROC-AUC 0.986 on an in-distribution held-out split. This record bundles the classifier and the mMACE backbone it depends on, licensed CC-BY-4.0 by the training collaborator.