Refactor-Worker-Job-Dispatch

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 plan, refactor, tests. A worker dispatches job types through a switch statement with repeated logging and timing code. Refactor the dispatch table and common instrumentation.

{
  "metrics": {
    "intent": {
      "checks": [
        {
          "contains": [
            "switch statement"
          ]
        },
        {
          "contains": [
            "dispatch table"
          ]
        },
        {
          "contains": [
            "instrumentation"
          ]
        }
      ]
    },
    "visible": {
      "checks": [
        {
          "contains": [
            "job types"
          ]
        },
        {
          "contains": [
            "logging"
          ]
        },
        {
          "contains": [
            "timing"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "unknown job"
          ]
        },
        {
          "contains": [
            "same handlers"
          ]
        },
        {
          "contains": [
            "tests"
          ]
        }
      ]
    }
  }
}