Fix packaging path for analyzer DLL - remove incorrect $(Configuration) variable

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: Copilot

src/ModelContextProtocol.Core/ModelContextProtocol.Core.csproj

@@ -58,7 +58,7 @@
 
   <!-- Package the analyzer DLL into the NuGet package -->
   <ItemGroup>
-    <None Include="$(ArtifactsDir)bin\ModelContextProtocol.SourceGenerators\$(Configuration)\netstandard2.0\ModelContextProtocol.SourceGenerators.dll" 
+    <None Include="$(ArtifactsDir)bin\ModelContextProtocol.SourceGenerators\netstandard2.0\ModelContextProtocol.SourceGenerators.dll" 
           Pack="true" 
           PackagePath="analyzers/dotnet/cs" 
           Visible="false" />