curl --request GET \
  --url https://operator.io/api/instances/{id}/activity \
  --header 'Authorization: Bearer <token>'

{
  "sessions": [
    {
      "id": "<string>",
      "title": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "parentId": "<string>"
    }
  ],
  "selectedSession": {
    "id": "<string>",
    "title": "<string>"
  },
  "lineCount": 123,
  "lines": [
    "<string>"
  ],
  "sessionChanged": true
}