Refactor-Array-Push-Loop-Spread

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 a for-loop that calls array.push() on each iteration to collect transformed items into a result array. Replace it with a single Array.prototype.map call that returns the new array. The output array must contain identical elements in the same order.

{
  "metrics": {
    "visible": {
      "checks": [
        {
          "contains": [
            "map"
          ]
        },
        {
          "contains": [
            "return"
          ]
        },
        {
          "contains": [
            "push"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "same order"
          ]
        },
        {
          "contains": [
            "no mutation"
          ]
        },
        {
          "contains": [
            "identical elements"
          ]
        }
      ]
    },
    "intent": {
      "checks": [
        {
          "contains": [
            "declarative"
          ]
        },
        {
          "contains": [
            "immutability"
          ]
        },
        {
          "contains": [
            "pipeline readability"
          ]
        }
      ]
    }
  }
}