Fixed two reliability issues highlighted by SonarCloud (#44)

src/mcpdotnet/Protocol/Transport/StdioServerTransport.cs

@@ -169,9 +169,12 @@ public sealed class StdioServerTransport : TransportBase, IServerTransport
     {
         _logger.TransportCleaningUp(EndpointName);
 
-        _shutdownCts?.Cancel();
-        _shutdownCts?.Dispose();
-        _shutdownCts = null;
+        if (_shutdownCts != null)
+        {
+            await _shutdownCts.CancelAsync().ConfigureAwait(false);
+            _shutdownCts.Dispose();
+            _shutdownCts = null;
+        }
 
         if (_readTask != null)
         {

tests/mcpdotnet.TestServer/Program.cs

@@ -5,6 +5,8 @@ using McpDotNet.Server;
 using Microsoft.Extensions.Logging;
 using Serilog;
 
+namespace McpDotNet.TestServer;
+
 internal static class Program
 {
     private static ILoggerFactory CreateLoggerFactory()
@@ -336,7 +338,7 @@ internal static class Program
         Log.Logger.Information("Server started.");
 
         // Run until process is stopped by the client (parent process)
-        while (true)
+        while (true) // NOSONAR
         {
             await Task.Delay(1000);
         }

tests/mcpdotnet.TestServer/mcpdotnet.TestServer.csproj

@@ -6,6 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <AssemblyName>TestServer</AssemblyName>
+    <RootNamespace>McpDotNet.TestServer</RootNamespace>
   </PropertyGroup>
 
   <ItemGroup>