```json
{
  "criteria": {
    "c1": "not_met",
    "c2": "not_met",
    "c3": "not_met",
    "c4": "not_met",
    "c5": "not_met"
  },
  "note": "The response fails to define the small-step operational semantics (omitting congruence rules entirely) and provides only an informal proof sketch that omits canonical forms lemmas and skips case details."
}
```