Harry Bayliss
34b41be1df
Stale timer bodies were re-delivered to the orchestrator pane after the parent had already processed the sub-agent's reply and called close_process. The timer registry held no link to the child lifecycle, so timers owned by or watching the closed child lingered until something triggered a fire — e.g. a trailing classifier tick for the now-removed child. Add an OnChildClosed hook to ChildEventListener, emit it from Session.Close (and the terminal-corpse path in reapChild), and have the timer manager prune the registry: cancel timers owned by the closed child; remove the closed child from each timer's watched list (cancel the timer outright when watched empties). Natural exit deliberately does not route through this hook — the classifier already emits an idle transition on exit which delivers any legitimate "fire when sub-agent finishes" semantics exactly once; cancelling on exit would swallow that.