Detach the node from its private network (addresses quarantine 7 days)

Detach a node from its private network - one membership row in your own workspace, and reversible with attach_network. Live: the mesh interface is removed, peers converge in seconds, and the node itself keeps running - detach never stops or restarts anything. The freed addresses quarantine for 7 days before they can ever be reused (stale peers and copied configs must drain before an address can mean someone else), and delete_network of an emptied network only becomes possible after that quarantine tail.