Parse a CIF with pymatgen and report whether it yields a usable crystal structure. Returns valid, errors, warnings, and a short summary (formula, atom count). Hard-fails on parse failure, empty structures, or overlapping atoms closer than 0.5 Å.

Parse a CIF with pymatgen and report whether it yields a usable crystal structure. Returns valid, errors, warnings, and a short summary (formula, atom count). Hard-fails on parse failure, empty structures, or overlapping atoms closer than 0.5 Å.