Use generic TaskCompletionSource<bool> in batched change-notification tests

The non-generic TaskCompletionSource is .NET 5+ only and fails to compile under net472, which ModelContextProtocol.Tests targets. Switch to the generic form in the DeferChangedEvents batch tests for tools, prompts, and resources: new TaskCompletionSource() becomes new TaskCompletionSource<bool>() and TrySetResult() becomes TrySetResult(true).

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

Author: jeffhandley

tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsPromptsTests.cs

@@ -188,13 +188,13 @@ public async Task DeferChangedEvents_BatchAddPrompts_EmitsExactlyOneNotification
         Assert.NotNull(serverPrompts);
 
         int notificationCount = 0;
-        var firstNotification = new TaskCompletionSource();
+        var firstNotification = new TaskCompletionSource<bool>();
 
         await using (client.RegisterNotificationHandler(NotificationMethods.PromptListChangedNotification, (notification, cancellationToken) =>
             {
                 if (Interlocked.Increment(ref notificationCount) == 1)
                 {
-                    firstNotification.TrySetResult();
+                    firstNotification.TrySetResult(true);
                 }
                 return default;
             }))

tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsResourcesTests.cs

@@ -222,13 +222,13 @@ public async Task DeferChangedEvents_BatchAddResources_EmitsExactlyOneNotificati
         Assert.NotNull(serverResources);
 
         int notificationCount = 0;
-        var firstNotification = new TaskCompletionSource();
+        var firstNotification = new TaskCompletionSource<bool>();
 
         await using (client.RegisterNotificationHandler(NotificationMethods.ResourceListChangedNotification, (notification, cancellationToken) =>
             {
                 if (Interlocked.Increment(ref notificationCount) == 1)
                 {
-                    firstNotification.TrySetResult();
+                    firstNotification.TrySetResult(true);
                 }
                 return default;
             }))

tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsToolsTests.cs

@@ -247,13 +247,13 @@ public async Task DeferChangedEvents_BatchAddTools_EmitsExactlyOneNotification()
         Assert.NotNull(serverTools);
 
         int notificationCount = 0;
-        var firstNotification = new TaskCompletionSource();
+        var firstNotification = new TaskCompletionSource<bool>();
 
         await using (client.RegisterNotificationHandler(NotificationMethods.ToolListChangedNotification, (notification, cancellationToken) =>
             {
                 if (Interlocked.Increment(ref notificationCount) == 1)
                 {
-                    firstNotification.TrySetResult();
+                    firstNotification.TrySetResult(true);
                 }
                 return default;
             }))