Debug-Event-Listener-Leak-V2

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 diagnosis, fix, tests. An event listener is registered inside a factory function each time the factory is called, but removeEventListener is never called; after many factory calls the same event fires dozens of stacked handlers causing memory growth and duplicate side effects. Identify the listener leak and fix it.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "addEventListener"
          ]
        },
        {
          "contains": [
            "factory"
          ]
        },
        {
          "contains": [
            "duplicate"
          ]
        },
        {
          "contains": [
            "memory"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "removeEventListener"
          ]
        },
        {
          "contains": [
            "cleanup"
          ]
        },
        {
          "contains": [
            "AbortController"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "listener leak"
          ]
        },
        {
          "contains": [
            "never removed"
          ]
        },
        {
          "contains": [
            "stacked handlers"
          ]
        }
      ]
    }
  }
}