{
  "kind": "failure_mapping",
  "expect": "valid",
  "description": "transport_error -> safe_retry; cross-checked through TransportError::Io",
  "data": {
    "failure_class": "transport_error",
    "expected_retry_class": "safe_retry",
    "transport_example": { "kind": "io", "detail": "broken pipe" }
  }
}
