Changes

PR #1564 by ksylvan: Add code_review pattern and updates in Pattern_Descriptions

• Added comprehensive code review pattern with systematic analysis framework and principal engineer reviewer role
• Introduced new patterns for code review, alpha extraction, and server analysis (review_code, extract_alpha, extract_mcp_servers)
• Enhanced pattern extraction script with improved clarity, docstrings, and specific error handling
• Implemented graceful JSONDecodeError handling in load_existing_file function with warning messages
• Fixed typo in analyze_bill_short pattern description and improved formatting in pattern management README