{
  "worker": "colo-lab",
  "deployLabel": "echo-zoneA-samezone",
  "colo": "CMH",
  "endpoints": {
    "/echo": "reflect headers + request.cf as seen by this worker",
    "/probe?target=URL&colo=CODE&n=5&referer=...": "teleport to colo then time cold+warm fetches"
  }
}