AGENTS.md

After making code changes:

• vex fix typecheck, format, and lint the project.
• vex test test the project.
• vex test --update update the test snapshots.

MusicXML tools:

• vex validate -i <path> validate a MusicXML file.
• vex render -i <path> render a MusicXML file to a PNG. Delete screenshots when you are done, unless you're showing the user something.