docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Client/ZB.MOM.WW.OtOpcUa.Client.UI.Tests/AlarmsViewModelTests.cs

@@ -12,6 +12,7 @@ public class AlarmsViewModelTests
     private readonly FakeOpcUaClientService _service;
     private readonly AlarmsViewModel _vm;
 
+    /// <summary>Initializes a new test instance.</summary>
     public AlarmsViewModelTests()
     {
         _service = new FakeOpcUaClientService();
@@ -19,6 +20,7 @@ public class AlarmsViewModelTests
         _vm = new AlarmsViewModel(_service, dispatcher);
     }
 
+    /// <summary>Verifies that SubscribeCommand cannot execute when disconnected.</summary>
     [Fact]
     public void SubscribeCommand_CannotExecute_WhenDisconnected()
     {
@@ -26,6 +28,7 @@ public class AlarmsViewModelTests
         _vm.SubscribeCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that SubscribeCommand cannot execute when already subscribed.</summary>
     [Fact]
     public void SubscribeCommand_CannotExecute_WhenAlreadySubscribed()
     {
@@ -34,6 +37,7 @@ public class AlarmsViewModelTests
         _vm.SubscribeCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that SubscribeCommand can execute when connected and not subscribed.</summary>
     [Fact]
     public void SubscribeCommand_CanExecute_WhenConnectedAndNotSubscribed()
     {
@@ -42,6 +46,7 @@ public class AlarmsViewModelTests
         _vm.SubscribeCommand.CanExecute(null).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that SubscribeCommand sets IsSubscribed flag.</summary>
     [Fact]
     public async Task SubscribeCommand_SetsIsSubscribed()
     {
@@ -53,6 +58,7 @@ public class AlarmsViewModelTests
         _service.SubscribeAlarmsCallCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that UnsubscribeCommand cannot execute when not subscribed.</summary>
     [Fact]
     public void UnsubscribeCommand_CannotExecute_WhenNotSubscribed()
     {
@@ -61,6 +67,7 @@ public class AlarmsViewModelTests
         _vm.UnsubscribeCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that UnsubscribeCommand clears IsSubscribed flag.</summary>
     [Fact]
     public async Task UnsubscribeCommand_ClearsIsSubscribed()
     {
@@ -73,6 +80,7 @@ public class AlarmsViewModelTests
         _service.UnsubscribeAlarmsCallCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that RefreshCommand calls the service.</summary>
     [Fact]
     public async Task RefreshCommand_CallsService()
     {
@@ -84,6 +92,7 @@ public class AlarmsViewModelTests
         _service.RequestConditionRefreshCallCount.ShouldBe(1);
     }
 
+    /// <summary>Verifies that RefreshCommand cannot execute when not subscribed.</summary>
     [Fact]
     public void RefreshCommand_CannotExecute_WhenNotSubscribed()
     {
@@ -92,6 +101,7 @@ public class AlarmsViewModelTests
         _vm.RefreshCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that alarm events are added to the collection.</summary>
     [Fact]
     public void AlarmEvent_AddsToCollection()
     {
@@ -108,6 +118,7 @@ public class AlarmsViewModelTests
         _vm.AlarmEvents[0].Message.ShouldBe("Temperature high");
     }
 
+    /// <summary>Verifies that Clear resets the view model state.</summary>
     [Fact]
     public void Clear_ResetsState()
     {
@@ -120,6 +131,7 @@ public class AlarmsViewModelTests
         _vm.IsSubscribed.ShouldBeFalse();
     }
 
+    /// <summary>Verifies that Teardown unregisters the event handler.</summary>
     [Fact]
     public void Teardown_UnhooksEventHandler()
     {
@@ -133,6 +145,7 @@ public class AlarmsViewModelTests
         _vm.AlarmEvents.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that the default polling interval is 1000ms.</summary>
     [Fact]
     public void DefaultInterval_Is1000()
     {