Context

Migrate etc/check_fmt.sh to a Go script under internal/cmd/check-fmt/main.go

Definition of done

• Taskfile updated to invoke the new cmd: go run ./internal/cmd/check-fmt/main.go
• etc/check_fmt.sh removed
• Equivalent error output when gofumpt or line-length checks fail

Use https://github.com/mvdan/gofumpt. This will require creating a new module at{{internal/cmd/check-fmt/main.go}}. Be sure to update go.work at root.

github.com/walle/lll is package main and has no importable API, so it will need to be invoked via os/exec. We should extract a generic exec helper into internal/scriptutil (or similar) so future Go-based scripts can share it. Example generated by Claude:

  func execCmd(env []string, name string, args ...string) error {
        cmd := exec.Command(name, args...)
        if env != nil {
                cmd.Env = env
        }
        cmd.Stdout = os.Stdout
        cmd.Stderr = os.Stderr
        if err := cmd.Run(); err != nil {
                return fmt.Errorf("%s %s: %w", name, strings.Join(args, " "), err)
        }
        return nil
  }

 _ = execCmd(nil, "lll", "-w", "4", "-l", "80", "-e", `^\s*\/\/(.+:\/\/| Output:)`, "--files")

Pitfalls

NA

• Will require periodically updating which version of gofumpt to use