{"criteria": {"c1": "met", "c2": "not_met", "c3": "not_met", "c4": "not_met", "c5": "not_met"}, "note": "No formal small-step rules (only a one-line description with no congruence rules), no canonical forms lemma, and the induction is a sketch that asserts 'reduces to the sum' / 'reduces to a branch' without using canonical forms to justify that a computation rule applies."}