$ yg check --json
exit: 1
--- stdout
{
  "schema": "yg-error/1",
  "code": "graph-missing",
  "what": "No .yggdrasil/ directory found in the current project.",
  "why": "Yggdrasil commands require an initialized graph at the project root.",
  "next": {
    "command": null,
    "text": "Run 'yg init' to bootstrap the graph, then re-run this command."
  }
}
--- stderr
error[graph-missing]: No .yggdrasil/ directory found in the current project.
  why:  Yggdrasil commands require an initialized graph at the project root.
next: Run 'yg init' to bootstrap the graph, then re-run this command.
