Compact the current conversation into a handoff document for another agent to pick up.

Hand the current conversation off to a fresh background agent that picks up the work immediately.

Coordinate supervised Orca workers: threaded messages, blocking ask/reply, task dispatch, worker_done/escalation waits, task DAGs, decision gates, coordinator loops, and decomposing work across agents. Use `orca-cli` for full ownership handoffs — "hand off", "handoff", "handover", "give this to anot