Background memory saves from the final task could still be in flight
when `CrewKickoffCompletedEvent`/`FlowFinishedEvent` fired, so telemetry
listeners tore down before `MemorySaveCompletedEvent` arrived and the
save span surfaced as "Span orphaned" errors in traces despite the
record persisting. `Crew` now drains all pending saves — including
per-agent `agent.memory` pools, which the old `finally`-only drain
missed entirely — before emitting the completion event, with the same
ordering applied to both `FlowFinishedEvent` emit paths in the flow
runtime.
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