Add slot management commands: - bd slot set <agent> <slot> <bead> - set slot (error if occupied) - bd slot clear <agent> <slot> - clear slot - bd slot show <agent> - show all slots These enforce cardinality constraints for agent bead slots. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>