3c0d90e8ef
A child's background processes are killed at its teardown and their notify_on_complete notices are suppressed in the parent, yet the child's terminal result still said `notify_on_complete: true` and the parent's delegation notice said nothing about processes left behind. Orchestrators believed "CI watcher running" and waited on a completion that could never arrive (recurring in the Sep 7 campaign sessions). - process_manage(action="handoff", session_id, data="<purpose>"), children only: process_registry.transfer_ownership flips owner_task_id/task_id/ session_key to the parent under the registry lock, so the completion is stamped with the parent's owner at exit, passes the parent's sa- filter, and is reaped by the parent, not the child. Cap 3 per child; an exited, foreign, or non-child request is a tool error. The purpose rides the event as handoff_note and renders in the parent's notice. - Child terminal(background=True, notify=True) now returns notify_on_complete=false plus a note: wait, kill, or hand off. - _ChildRun.account_background_processes records handed_off_processes and orphaned_processes on the result before cleanup kills the leftovers; the parent's delegation block renders both.