{
  "$id": "checkpoint.v1",
  "title": "Task checkpoint (checkpoints/<task_id>.json)",
  "type": "object",
  "required": ["schema_version"],
  "properties": {
    "schema_version": { "type": "integer", "minimum": 1 },
    "task_id": { "type": "string" },
    "status": { "type": "string" },
    "files_touched": { "type": "array" },
    "nubosloop": { "type": "object" }
  }
}