Add comprehensive guide for VS Code session and window architecture This document provides deep dive technical documentation for understanding VS Code's session and window architecture, crucial for extensions that monitor logs or track user activity. Key content areas: - VS Code session lifecycle and management - Window creation and isolation concepts - Log directory structure and navigation - Extension context and logUri usage - Real-time vs historical monitoring strategies - Implementation examples and best practices - Common misconceptions and debugging approaches This guide serves as the definitive reference for extension developers building log monitoring and analytics features.