Refactor backend operation tests to return Task instead of async Task for improved consistency

Author: jongalloway

tests/NLWebNet.Tests/Integration/BackendOperationTests.cs

@@ -98,7 +98,7 @@ public async Task BackendOperation_MockDataBackend_AllOperationsWork()
     /// Tests backend manager operations with multiple backends
     /// </summary>
     [TestMethod]
-    public async Task BackendOperation_BackendManager_ManagesBackendsCorrectly()
+    public Task BackendOperation_BackendManager_ManagesBackendsCorrectly()
     {
         var backendManager = _serviceProvider.GetRequiredService<IBackendManager>();
 
@@ -138,6 +138,8 @@ public async Task BackendOperation_BackendManager_ManagesBackendsCorrectly()
         // This test verifies the backend manager can coordinate query execution
         // The actual implementation details depend on the specific backend manager implementation
         Console.WriteLine("✓ BackendManager operations validated");
+
+        return Task.CompletedTask;
     }
 
     /// <summary>

tests/NLWebNet.Tests/Integration/MultiBackendIntegrationTests.cs

@@ -263,7 +263,7 @@ public async Task EndToEnd_MultiBackendConsistency_ResultsAreConsistent()
     /// Tests backend capability verification across multiple backends
     /// </summary>
     [TestMethod]
-    public async Task EndToEnd_BackendCapabilities_AreAccessibleAndValid()
+    public Task EndToEnd_BackendCapabilities_AreAccessibleAndValid()
     {
         var services = new ServiceCollection();
         services.AddNLWebNetMultiBackend(options =>
@@ -303,5 +303,7 @@ public async Task EndToEnd_BackendCapabilities_AreAccessibleAndValid()
 
             Console.WriteLine($"✓ Backend '{backend.Id}' capabilities validated");
         }
+
+        return Task.CompletedTask;
     }
 }