interuss/astm-utm-protocol — reverse-engineered prompt

Build me a simple documentation project for the ASTM UTM protocol. The main thing should be a YAML API spec called utm.yaml that someone can open locally in a browser using Redoc with Docker. I don’t need a full web app or backend, just a clean repo that makes the protocol easy to view and share.

Add a short README that explains what the project is, how to run the local viewer, and where to find the docs. Also include a diagrams area with a markdown sequence diagram for the case where planning happens while one USS is down. Keep the wording clear enough for someone who understands aviation systems but isn’t deep in the code.

Please make the project tidy and easy to extend later if more protocol diagrams or tools are added. Look up current Redoc or OpenAPI docs online if you need to.