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Test all key scenarios for the cache refresh mechanism: - Delete during refresh: subscription delete is buffered and replayed, preventing ghost entries from the stale snapshot - Create during refresh: subscription create is buffered and replayed, preventing lost entries - Stale entries removed: entries absent from the filer snapshot are cleaned from the cache - Local delete buffered: direct DeleteEntry during refresh is both applied immediately and replayed after commit - Local create buffered: direct InsertEntry during refresh is preserved after snapshot commit - Cancel discards buffer: CancelRefresh drops buffered events and resumes normal event processing - Concurrent deletes (issue #8442 scenario): 1000 concurrent delete events racing with a stale snapshot all resolve correctly