{
  "kind": "failure_mapping",
  "expect": "valid",
  "description": "internal_error -> retry_after_reread; cross-checked through TransportError::Internal",
  "data": {
    "failure_class": "internal_error",
    "expected_retry_class": "retry_after_reread",
    "transport_example": { "kind": "internal", "detail": "panic in serializer" }
  }
}
