Breakout Claude

Route an idea that surfaces mid-task but does not belong to the current repository into its own repo and its own agent, without derailing the work in flight. Uses the cross-session SendMessage/ListAgents layer for a push-model handoff — the seed brief is written to disk in the new repo and the message carries a pointer to it. Companion to interrupt-claude (same-repo interruption routing) and claude-hopper (session spawning and handover); breakout splits tracks rather than work or time. WIP.