Refactor-Class-To-Functions

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 an InventoryManager class with stateless operations into pure exported handler functions. Keep public operation names.

{
  "metrics": {
    "visible": {
      "checks": [
        {
          "contains": [
            "pure function"
          ]
        },
        {
          "contains": [
            "handler"
          ]
        },
        {
          "contains": [
            "inventory"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "operation names"
          ]
        },
        {
          "contains": [
            "no shared state"
          ]
        },
        {
          "contains": [
            "exports"
          ]
        }
      ]
    },
    "intent": {
      "checks": [
        {
          "contains": [
            "class"
          ]
        },
        {
          "contains": [
            "stateless"
          ]
        },
        {
          "contains": [
            "separation"
          ]
        }
      ]
    }
  }
}