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85af540076
* feat: add LangSmith tracing integration Add optional LangSmith tracing support that can be enabled via environment variables (LANGSMITH_TRACING, LANGSMITH_API_KEY, LANGSMITH_PROJECT, LANGSMITH_ENDPOINT). When enabled, a LangChainTracer callback is attached to chat models and run metadata is injected for trace tagging. Co-Authored-By: Claude <[email protected]> * Update backend/src/config/tracing_config.py Co-authored-by: Copilot <[email protected]> * Update backend/src/agents/lead_agent/agent.py Co-authored-by: Copilot <[email protected]> * Update backend/src/agents/lead_agent/agent.py Co-authored-by: Copilot <[email protected]> * Update backend/src/models/factory.py Co-authored-by: Copilot <[email protected]> * Add threading lock to ensure thread-safe access to tracing configuration --------- Co-authored-by: Claude <[email protected]> Co-authored-by: Willem Jiang <[email protected]> Co-authored-by: Copilot <[email protected]>