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- Start the ack confirmation with Task.Run + ConfigureAwait(false) so it never depends on the ReceiveAsync handler's ActorTaskScheduler (the PostStop abandon-and-revert report must run after the actor stopped). - DriverInstanceActorAckConfirmationTests: a confirmation that faults after the handler returned is reported; one pending at actor stop is reported; a confirmed ack reports nothing (positive control). - Deterministic tracker matching test (Raise/Clear/Retrigger/other alarm do not confirm; case-insensitive match does). - AdminUI min/max on the confirm-timeout field; Galaxy.md documents the reconnect, UNACK_RTN-as-Clear and RPC-budget limits. Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk