Prepare release v2.2.0

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jeffhandley

src/Directory.Build.props

@@ -5,7 +5,7 @@
     <PackageProjectUrl>https://csharp.sdk.modelcontextprotocol.io</PackageProjectUrl>
     <RepositoryUrl>https://github.com/modelcontextprotocol/csharp-sdk</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
-    <VersionPrefix>2.1.0</VersionPrefix>
+    <VersionPrefix>2.2.0</VersionPrefix>
     <VersionSuffix></VersionSuffix>
     <Authors>ModelContextProtocol</Authors>
     <Copyright>© Model Context Protocol a Series of LF Projects, LLC.</Copyright>

src/PACKAGE.md

@@ -4,7 +4,7 @@
 
 The official C# SDK for the [Model Context Protocol](https://modelcontextprotocol.io/), enabling .NET applications, services, and libraries to implement and interact with MCP clients and servers. Please visit the [API documentation](https://csharp.sdk.modelcontextprotocol.io/api/ModelContextProtocol.html) for more details on available functionality.
 
-See the [release notes](https://github.com/modelcontextprotocol/csharp-sdk/releases/tag/v2.1.0) for what's new in this version.
+See the [release notes](https://github.com/modelcontextprotocol/csharp-sdk/releases/tag/v2.2.0) for what's new in this version.
 
 ## Packages