Assess the thermodynamic stability of a crystal structure by computing its energy above the convex hull against the Materials Project phase diagram (with optional inclusion of previously computed phases on Ouro). Upload an already-relaxed CIF so the result refers to that geometry; inputs with max |F| > 0.05 eV/Å are rejected unless allow_unrelaxed is set (which relaxes internally first). Also rejects overlapping-atom CIFs unless bypass_cif_health_screen is set. Returns e_above_hull (eV/atom), decomposition products, and an interactive phase diagram.