Refactor-Error-Envelope

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys refactor, rationale, tests. Refactor ad hoc error objects into a consistent error envelope builder. Preserve status codes and public messages.

{
  "metrics": {
    "visible": {
      "checks": [
        {
          "contains": [
            "error envelope"
          ]
        },
        {
          "contains": [
            "builder"
          ]
        },
        {
          "contains": [
            "status codes"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "public messages"
          ]
        },
        {
          "contains": [
            "ad hoc"
          ]
        },
        {
          "contains": [
            "consistent"
          ]
        }
      ]
    },
    "intent": {
      "checks": [
        {
          "contains": [
            "modernization"
          ]
        },
        {
          "contains": [
            "typed"
          ]
        },
        {
          "contains": [
            "contract"
          ]
        }
      ]
    }
  }
}