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* perf: reduce framework overhead for NVIDIA benchmarks - Lazy initialize event bus thread pool and event loop on first emit() instead of at import time (~200ms savings) - Skip trace listener registration (50+ handlers) when tracing disabled - Skip trace prompt in non-interactive contexts (isatty check) to avoid 20s timeout in CI/Docker/API servers - Skip flush() when no events were emitted (avoids 30s timeout waste) - Add _has_pending_events flag to track if any events were emitted - Add _executor_initialized flag for lazy init double-checked locking All existing behavior preserved when tracing IS enabled. No public APIs changed - only conditional guards added. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * fix: address PR review comments — tracing override, executor init order, stdin guard, unused import Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * style: fix ruff formatting in trace_listener.py and utils.py --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com> Co-authored-by: Iris Clawd <iris@crewai.com> Co-authored-by: Greyson LaLonde <greyson.r.lalonde@gmail.com>