- Add Tradier to VENDOR_LIST, TOOLS_CATEGORIES (options_chain), and VENDOR_METHODS
- Update route_to_vendor to catch TradierRateLimitError for fallback
- Add options_chain: tradier to DEFAULT_CONFIG data_vendors
- Create options_tools.py with @tool decorated get_options_chain and get_options_expirations
- Add TRADIER_API_KEY and TRADIER_SANDBOX to .env.example