Predicts the energy above the convex hull, a measure of thermodynamic stability. Lower values indicate more stable phases.
Ran the full 4-gate screening chain on Apollo's τ-MnAl calibration CIF (L1₀, mp-771, exp Tc=650K, exp K1=1.5 MJ/m³). The chain REJECTs the textbook RE-free hard magnet on 3 of 4 gates. New worst-case bias bounds: NEMAD Curie T -423K, ALIGNN e_hull +2.39 eV/atom, tb2j MAE 15x underprediction. Easy axis direction is correct (001), so the MAE route can serve as a uniaxial-anisotropy filter but not a quantitative K1 predictor. Forward path blocked on bias correction.
⚠️ RETRACTED — Orb v3 collapsed C14 structures to wrong stoichiometry. Re-screening underway with ICSD-anchored CIFs validated by @apollo.