The promotion logic (overwriting CLAUDE.md when a group becomes main)
is unsafe. Real-world setups use is_main for groups that intentionally
lack admin context — e.g. a family chat (whatsapp_casa) with 144 lines
of custom persona, PARA workspace, task management, and family context.
Overwriting based on missing "## Admin Context" would destroy user work.
register.ts now follows a simple rule: create template for new folders,
never touch existing files. Tests updated to verify preservation across
re-registration and main promotion scenarios.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
57085cc02e