- Add enable_multiuser tool to enable multiuser mode on sessions
- Add attach_multiuser tool to provide attach instructions
- Add add_user tool for access control list management
- Peek functionality works seamlessly with multiuser sessions
- Create comprehensive test for multiuser functionality
- All existing functionality preserved and tested
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
