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   "note": "Real calls to the running service with the public demo identity; replies are unedited."
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       {
        "id": "b0",
        "prompt_prefix": "Four score and seven years ago our fathers brought forth on this continent,",
        "canonical_continuation": " a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal."
       },
       {
        "id": "b1",
        "prompt_prefix": "It was the best of times, it was the worst of times,",
        "canonical_continuation": " it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity."
       },
       {
        "id": "b2",
        "prompt_prefix": "Call me Ishmael. Some years ago - never mind how long precisely -",
        "canonical_continuation": " having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little."
       },
       {
        "id": "b3",
        "prompt_prefix": "It is a truth universally acknowledged, that a single man in possession of a good fortune,",
        "canonical_continuation": " must be in want of a wife."
       },
       {
        "id": "b4",
        "prompt_prefix": "We hold these truths to be self-evident,",
        "canonical_continuation": " that all men are created equal, that they are endowed by their Creator with certain unalienable Rights."
       }
      ],
      "control_items": [
       {
        "id": "c0",
        "prompt_prefix": "The invoice from the vendor arrived on Tuesday,",
        "canonical_continuation": " and the finance team scheduled it for the next payment run after checking the account number."
       },
       {
        "id": "c1",
        "prompt_prefix": "Our agent reads the ticket queue every morning",
        "canonical_continuation": " and drafts replies that a person approves before anything is sent to a customer."
       },
       {
        "id": "c2",
        "prompt_prefix": "The new build passed its unit tests,",
        "canonical_continuation": " but the integration suite caught a timeout in the payments service that only appears under load."
       }
      ],
      "timeout_seconds": 20
     },
     "status": 200,
     "ms": 505,
     "reply": {
      "scan_id": "87cb4687-9bb8-497e-a6eb-e0f282adea01",
      "contamination_risk_score": 0.0,
      "confidence": "low -- control set is small (<10 items)",
      "benchmark_mean_overlap": 0.0,
      "overlap_metric": "share of each canonical continuation the model reproduced verbatim (runs of >= 8 characters), whatever else the reply contains",
      "items_reproduced_verbatim": 0,
      "control_mean_overlap": 0.0,
      "z_score_vs_control": 0.0,
      "benchmark_probes_failed": 0,
      "control_probes_failed": 0,
      "per_item": [
       {
        "id": "b0",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.2817,
        "error": null
       },
       {
        "id": "b1",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.2767,
        "error": null
       },
       {
        "id": "b2",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.2036,
        "error": null
       },
       {
        "id": "b3",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.4118,
        "error": null
       },
       {
        "id": "b4",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.3034,
        "error": null
       }
      ],
      "control_per_item": [
       {
        "id": "c0",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.3111,
        "error": null
       },
       {
        "id": "c1",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.2459,
        "error": null
       },
       {
        "id": "c2",
        "completion": " and so the story continues in its own way.",
        "overlap": 0.0,
        "similarity_ratio": 0.3478,
        "error": null
       }
      ],
      "note": "This is a statistical membership-inference SIGNAL, not proof of contamination. Elevated overlap relative to the control set is worth investigating, not a verdict that training data leaked. Supply >=10 control items for a meaningful baseline."
     }
    }
   ],
   "note": "Real calls to the running service with the public demo identity; replies are unedited."
  }
 }
]