For AI agents: the complete documentation index is available at https://mfeflow.github.io/mfeflow/llms.txt, the full documentation bundle is available at https://mfeflow.github.io/mfeflow/llms-full.txt, and this page is available as Markdown at https://mfeflow.github.io/mfeflow/errors/E601.md.
Add "cli": "" to mfeflow.json (the version you created the project with), or give the shell a plain @mfeflow/runtime range in its package.json, then run the command again.
