Yijia Xiao 54cdb146d0 feat: add footer statistics tracking with LangChain callbacks ...

- Add StatsCallbackHandler for tracking LLM calls, tool calls, and tokens
- Integrate callbacks into TradingAgentsGraph and all LLM clients
- Dynamic agent/report counts based on selected analysts
- Fix report completion counting (tied to agent completion)

2026-02-03 22:27:20 +00:00

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