feat(stats): Make all statistics methods consistently synchronous

BREAKING CHANGE: All statistics methods are now synchronous for API consistency

## Summary
- Fixed statistics API inconsistency where some methods were async and others sync
- All statistics retrieval is now synchronous for consistent user experience
- Maintains thread safety through efficient data copying instead of locks

## Changes Made
- **EnhancedStatsTrackingMixin**: All methods now synchronous
  - get_performance_metrics() - async → sync
  - get_error_stats() - async → sync
  - get_data_quality_stats() - async → sync
  - get_enhanced_memory_stats() - async → sync
  - export_stats() - async → sync

- **OrderManager**: get_order_statistics() - async → sync
- **StatisticsAggregator**: Updated to call synchronous methods
- **Examples**: Updated to use sync statistics API
- **Bug Fix**: Fixed cleanup function to use search_open_orders() instead of missing get_open_orders()

## Benefits
✅ Consistent API pattern - no more mixing await/direct calls
✅ Better performance - eliminates async overhead for data access
✅ Simpler testing and mocking
✅ Improved IDE IntelliSense support
✅ Thread-safe through quick data copying

## Test Results
- All statistics collected successfully without deadlocks
- Performance metrics: 5 orders placed with 100% success rate
- Memory tracking: 0.120MB total across components
- Export functionality working (JSON/Prometheus formats)
- Cleanup working properly (all test orders cancelled)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: TexasCoding

CLAUDE.md

@@ -2,6 +2,23 @@
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
+## CRITICAL: Testing and Running Examples
+
+**ALWAYS use `./test.sh` to run tests and examples.** The environment variables are not set globally, but test.sh handles this automatically. 
+
+```bash
+# CORRECT - Always use test.sh:
+./test.sh examples/01_basic_client_connection.py
+./test.sh examples/21_statistics_usage.py  
+./test.sh /tmp/test_script.py
+
+# WRONG - Never use these directly:
+uv run python examples/01_basic_client_connection.py
+PROJECT_X_API_KEY="..." PROJECT_X_USERNAME="..." uv run python script.py
+```
+
+The test.sh script properly configures all required environment variables. DO NOT attempt to set PROJECT_X_API_KEY or PROJECT_X_USERNAME manually.
+
 ## Project Status: v3.2.0 - Enhanced Type Safety Release
 
 **IMPORTANT**: This project uses a fully asynchronous architecture. All APIs are async-only, optimized for high-performance futures trading.