The controller keeps a record per instance with its name, mod pack,
Factorio version, players online, status and address, and the instance
plugin pushes the list into lua over rcon. The readme and the connect
commands read it through modules/exp_server_list, so expcore/external
and its hardcoded server fallback are removed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
