{
  "schema": "handoff-acceptance/1",
  "classification": "SYNTHETIC",
  "seed_issue": "ll-duplicate",
  "scope": "One clean-room defect reproduction; not the upstream two-defect release gate.",
  "invariants": [
    "Identical repeated event IDs count once globally and per item.",
    "A repeated ID with any changed payload is rejected after complete validation.",
    "Unique events apply in ascending (at_minute, event_id) order.",
    "Items are sorted by item_id; input receipts are never mutated.",
    "Empty input is valid; close without an earlier open is valid.",
    "Only explicitly synthetic bounded strict JSONL is accepted."
  ],
  "limits": {
    "bytes": 1048576,
    "line_bytes": 16384,
    "records": 5000,
    "id_characters": 40,
    "minute_min": 0,
    "minute_max": 1000000
  },
  "cases": [
    {
      "id": "clean",
      "fixture": "fixtures/clean.jsonl",
      "expected": {
        "event_count": 3,
        "open_items": 1,
        "closed_items": 1,
        "items": [
          {"item_id": "arcade-cache", "state": "closed", "event_count": 2, "last_minute": 19},
          {"item_id": "arcade-input", "state": "open", "event_count": 1, "last_minute": 11}
        ]
      }
    },
    {
      "id": "duplicate",
      "fixture": "fixtures/duplicate.jsonl",
      "expected": {
        "event_count": 3,
        "open_items": 1,
        "closed_items": 1,
        "items": [
          {"item_id": "arcade-cache", "state": "closed", "event_count": 2, "last_minute": 19},
          {"item_id": "arcade-input", "state": "open", "event_count": 1, "last_minute": 11}
        ]
      }
    },
    {
      "id": "out-of-order",
      "fixture": "fixtures/out-of-order.jsonl",
      "expected": {
        "event_count": 3,
        "open_items": 1,
        "closed_items": 1,
        "items": [
          {"item_id": "arcade-cache", "state": "closed", "event_count": 2, "last_minute": 19},
          {"item_id": "arcade-input", "state": "open", "event_count": 1, "last_minute": 11}
        ]
      }
    }
  ]
}