docs: move the 4.0.1 update to the end of the v4 release notes
docs: add 4.0.1 update to the v4 release notes
docs: document constants removed in 4.0.1 and the new Vertex AI model constants
docs: add new Gemini model constants to Supported Models
docs: Imagen is retired on Vertex AI too; document the obsolete Imagen APIs
docs: use python-genai Live API type names and add rename table to the migration guide
docs: reorganize wiki for v4 (new API pages, migration guide, release notes, merged caching and legacy AQA pages)
Updated _Sidebar (markdown)
Created MCP (Model Context Protocol) Integration (markdown)
Created Caching Client (markdown)
Created Vertex RAG Engine (markdown)
Updated NativeAOT and Trimming Guidelines (markdown)
Updated Home (markdown)
Updated NativeAOT Trimming Guidelines (markdown)
Created NativeAOT/Trimming Guidelines (markdown)
Updated Function Calling (markdown)
Updated Semantic Search Retrieval with Google AQA (markdown)
Created Semantic Search Retrieval with Google AQA (markdown)
Updated Web Application Integration (markdown)
Created Microsoft.Extensions.AI IChatClient Implementation (markdown)