- Create tradingagents/validation.py with comprehensive validation functions:
- validate_ticker/validate_tickers for ticker symbol validation
- validate_date/validate_date_range for date validation
- parse_date for flexible date parsing (multiple formats)
- Helper functions: is_valid_ticker, is_valid_date, is_trading_day
- get_previous_trading_day, get_next_trading_day utilities
- Add validation to y_finance.py (get_YFin_data_online, get_stock_stats_indicators_window)
- Add validation to trading_graph.py propagate method
- Create comprehensive test suite (55 tests) in tests/test_validation.py
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Co-Authored-By: Claude <noreply@anthropic.com>
Joseph O'Brien