11-task plan for migrating LEM from manual switch/flag.FlagSet
to core/go pkg/cli registry pattern with grouped commands.
Co-Authored-By: Virgil <virgil@lethean.io>
Replace manual switch/flag.FlagSet with cli.Main() + WithCommands().
6 command groups, 28 commands, full framework lifecycle.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>