feat: Implement comprehensive logging system
Adds a production-ready logging system with the following features:
## Core Features
- Structured logging with rich context and metadata
- Multiple log levels (DEBUG, INFO, WARNING, ERROR, CRITICAL)
- File and console output with separate handlers
- Automatic log rotation (prevents disk space issues)
- Component-specific loggers for different parts of the system
- Performance tracking with built-in metrics
- API call tracking with cost and token monitoring
## New Components
- tradingagents/utils/logging_config.py: Core logging module
- TradingAgentsLogger: Main logger class
- StructuredFormatter: Custom formatter with context
- APICallLogger: Dedicated API call tracking
- PerformanceLogger: Operation timing and metrics
## Log Files Created (in logs/ directory)
- tradingagents.log: All application logs (10MB rotation, 5 backups)
- errors.log: Errors only (5MB rotation, 3 backups)
- api_calls.log: API call tracking
- memory.log: Memory operations
- agents.log: Agent execution
- performance.log: Performance metrics
## Integration
- Updated memory.py: Full logging integration with context
- Logs initialization, embeddings, add/get operations
- Tracks API calls and performance
- Provides detailed error context
- Updated trading_graph.py: Comprehensive graph logging
- Logs initialization, propagation, reflection
- Tracks component setup and execution
- Performance metrics for all major operations
- Updated default_config.py: Added logging configuration
- log_level, log_dir, log_to_console, log_to_file
## Documentation
- docs/LOGGING.md: Complete logging documentation (797 lines)
- Quick start guide
- Configuration examples
- Best practices
- API reference
- Troubleshooting
## Benefits
- Better debugging and troubleshooting
- Production monitoring capabilities
- API cost tracking
- Performance analysis
- Audit trail for decisions
- Easier issue diagnosis
Tested and working. See docs/LOGGING.md for complete usage guide.
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