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## Why PR #27007 moved MultiAgentV2 interruption reporting from the legacy collaboration close event to `SubAgentActivity::Interrupted`. App-server's missing-thread cleanup still ran only for the legacy event, so an interrupted child that had already been unloaded could remain marked as loaded and running in `ThreadWatchManager`. That leaves thread status and running-turn accounting stale, including the count used during graceful shutdown. ## What changed - Handle `SubAgentActivity::Interrupted` separately in app-server event processing. - Remove the child's thread watch when `ThreadManager` no longer has that thread. - Continue forwarding the same completed sub-agent activity notification to clients. ## Testing - Added a regression test that starts with a running watch for an unloaded child, applies the interrupted activity event, and verifies the watch is removed, the running count returns to zero, and the client notification is still emitted.