Changes

PR #1389 by ksylvan: Create Coding Feature

• Feat: add fabric_code tool and create_coding_feature pattern allowing Fabric to modify existing codebases
• Add file management system for AI-driven code changes with secure file application mechanism
• Fix: improve JSON parsing in ParseFileChanges to handle invalid escape sequences and control characters
• Refactor: rename fabric_code tool to code_helper for clarity and update all documentation references
• Update chatter to process AI file changes and improve create_coding_feature pattern documentation

Direct commits

• Docs: improve README link by fixing broken what-and-why link reference