## Racket via rackup

This project's Racket toolchain is managed by
[rackup](https://samth.github.io/rackup/).

- Run Racket tools through the toolchain with `rackup run <toolchain> -- <cmd>`,
  e.g. `rackup run stable -- raco test .`. Do NOT use `rackup switch` in
  scripts — it only takes effect in interactive shells.
- Install the toolchain first if needed: `rackup install stable` (idempotent).
- Machine-readable state: `rackup list --ids`, `rackup current line`,
  `rackup which racket`.
- Full agent guide: `rackup help agents`.