Add --max-cost flag (USD) to cap LLM spend per analysis run.
Review feedback applied:
- Guard trace[-1] IndexError when stream yields no chunks
- Remove speculative model entries from pricing table
- Move budget checks inside lock for thread safety
- Split log_ticker_spend into format + log for modularity
Closes#524
- OpenAI: add GPT-5.4, GPT-5.4 Pro; remove o-series and legacy GPT-4o
- Anthropic: add Claude Opus 4.6, Sonnet 4.6; remove legacy 4.1/4.0/3.x
- Google: add Gemini 3.1 Pro, 3.1 Flash Lite; remove deprecated
gemini-3-pro-preview and Gemini 2.0 series
- xAI: clean up model list to match current API
- Simplify UnifiedChatOpenAI GPT-5 temperature handling
- Add missing tradingagents/__init__.py (fixes pip install building)
Clayton Brown
Yijia-Xiao