`opencode auth --foo` prints help text twice

[louis-brunet]

When the auth command is incorrectly used without a subcommand and with an invalid option, there are two errors shown, each with its own help text.
This is not a big issue but I assume the desired behavior is to only print one help text in this case.
This only happens with the auth command, probably because it is the only command that requires a subcommand.

 ❯ opencode auth --foo --bar
opencode auth

manage credentials

Commands:
  opencode auth login   login to a provider
  opencode auth logout  logout from a configured provider
  opencode auth list    list providers                             [aliases: ls]

Options:
  --help        Show help                                              [boolean]
  --version     Show version number                                    [boolean]
  --print-logs  Print logs to stderr                                   [boolean]
2025-06-16T18:12:55 +45ms service=default Not enough non-option arguments: got 0, need at least 1
opencode auth

manage credentials

Commands:
  opencode auth login   login to a provider
  opencode auth logout  logout from a configured provider
  opencode auth list    list providers                             [aliases: ls]

Options:
  --help        Show help                                              [boolean]
  --version     Show version number                                    [boolean]
  --print-logs  Print logs to stderr                                   [boolean]
2025-06-16T18:12:55 +4ms service=default Unknown arguments: foo, bar

I believe this can be fixed by exiting the program in the yargs fail() function, as shown in the yargs documentation's example.

  .fail((msg, err) => {
    if (
      msg.startsWith("Unknown argument") ||
      msg.startsWith("Not enough non-option arguments")
    ) {
      cli.showHelp("log")
    }
    Log.Default.error(msg, {
      err,
    })
    process.exit(1) // <-- add this line?
  })