Bump to version 1.0.0 (stable) (#1384)

Author: jeffhandley

src/Directory.Build.props

@@ -6,7 +6,6 @@
     <RepositoryUrl>https://github.com/modelcontextprotocol/csharp-sdk</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <VersionPrefix>1.0.0</VersionPrefix>
-    <VersionSuffix>rc.1</VersionSuffix>
     <Authors>ModelContextProtocol</Authors>
     <Copyright>© Anthropic and Contributors.</Copyright>
     <PackageTags>ModelContextProtocol;mcp;ai;llm</PackageTags>