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Without this, double-clicking drover.exe printed CLI help to stdout — fine in a terminal but invisible to a user who just clicked an icon. Adding a RunE on the root command opens the smoke-test message box when no subcommand was given. CLI flags (--version, --help) and explicit subcommands keep their old behaviour. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>