8b4b236968
Implements DeliveryInterestTracker (consumer.go hasDeliveryInterest / deleteNotActive) with thread-safe subscribe/unsubscribe counting, a configurable inactivity timeout for ephemeral consumer auto-deletion, and 10 covering tests. Also adds SlopwatchSuppress to a pre-existing Task.Delay in MaxDeliveriesTests.cs that was already testing time-based expiry.