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- Protect _aggregated_usage_metrics with a lock so concurrent LLMCallCompletedEvent handlers can't race the read-modify-write inside add_usage_metrics, and so usage_metrics snapshots are consistent. - Wire the usage aggregation listener into resume_async so LLM calls during outcome collapsing and downstream crews continue to roll up into flow.usage_metrics after a paused-then-resumed kickoff. Restores current_flow_id to the original kickoff's match id when none is set, and detaches in finally. - Guard against reentrant kickoff on the same Flow instance: only the outer kickoff captures _flow_match_id, resets the accumulator, and owns the listener lifecycle. Inner reentrant calls pass through and no longer wipe outer state or detach the shared handler. - Rename test_snapshot_is_immutable to test_usage_metrics_returns_independent_copy to reflect that the property returns a copy of a (still-mutable) UsageMetrics. - Extend test_handler_is_unregistered_after_kickoff to also cover the failure path, confirming the handler is removed when kickoff raises.