H1 Mn-Al-C GGen exploration candidate (action 01a06e15-0cb2-702f-bc28-fec045530a28, e_above_hull 69 meV/atom). Validated 2026-09-04: parsed, reduced formula Mn10Al3C, 14 sites, SG P-1 (2) (symprec 0.01 and 0.1), density 6.64 g/cm3, min pair distance 1.869 A, ordered.