{
  "steps": [
    { "op": "initialize" },
    { "op": "newSession" },
    {
      "op": "promptAndCancel",
      "text": "Start a long task; this turn will be cancelled mid-stream.",
      "waitForFile": { "path": ".dsh-snapshot-stream-ready" }
    },
    { "op": "waitForTurnEnd" }
  ]
}