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/ReadWriteViewModelTests.cs

@@ -12,6 +12,7 @@ public class ReadWriteViewModelTests
     private readonly FakeOpcUaClientService _service;
     private readonly ReadWriteViewModel _vm;
 
+    /// <summary>Initializes a new instance of the ReadWriteViewModelTests class.</summary>
     public ReadWriteViewModelTests()
     {
         _service = new FakeOpcUaClientService
@@ -22,6 +23,7 @@ public class ReadWriteViewModelTests
         _vm = new ReadWriteViewModel(_service, dispatcher);
     }
 
+    /// <summary>Verifies that the read command cannot execute when disconnected.</summary>
     [Fact]
     public void ReadCommand_CannotExecute_WhenDisconnected()
     {
@@ -30,6 +32,7 @@ public class ReadWriteViewModelTests
         _vm.ReadCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that the read command cannot execute when no node is selected.</summary>
     [Fact]
     public void ReadCommand_CannotExecute_WhenNoNodeSelected()
     {
@@ -38,6 +41,7 @@ public class ReadWriteViewModelTests
         _vm.ReadCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that the read command can execute when connected and a node is selected.</summary>
     [Fact]
     public void ReadCommand_CanExecute_WhenConnectedAndNodeSelected()
     {
@@ -46,6 +50,7 @@ public class ReadWriteViewModelTests
         _vm.ReadCommand.CanExecute(null).ShouldBeTrue();
     }
 
+    /// <summary>Verifies that the read command updates value and status.</summary>
     [Fact]
     public async Task ReadCommand_UpdatesValueAndStatus()
     {
@@ -63,6 +68,7 @@ public class ReadWriteViewModelTests
         (_service.ReadCallCount - countBefore).ShouldBe(1);
     }
 
+    /// <summary>Verifies that auto-read fires on selection change when connected.</summary>
     [Fact]
     public void AutoRead_OnSelectionChange_WhenConnected()
     {
@@ -74,6 +80,7 @@ public class ReadWriteViewModelTests
         _service.ReadCallCount.ShouldBeGreaterThanOrEqualTo(1);
     }
 
+    /// <summary>Verifies that null selection does not call the service.</summary>
     [Fact]
     public void NullSelection_DoesNotCallService()
     {
@@ -83,6 +90,7 @@ public class ReadWriteViewModelTests
         _service.ReadCallCount.ShouldBe(0);
     }
 
+    /// <summary>Verifies that the write command updates write status.</summary>
     [Fact]
     public async Task WriteCommand_UpdatesWriteStatus()
     {
@@ -100,6 +108,7 @@ public class ReadWriteViewModelTests
         _service.LastWriteValue.ShouldBe("NewValue");
     }
 
+    /// <summary>Verifies that the write command cannot execute when disconnected.</summary>
     [Fact]
     public void WriteCommand_CannotExecute_WhenDisconnected()
     {
@@ -108,6 +117,7 @@ public class ReadWriteViewModelTests
         _vm.WriteCommand.CanExecute(null).ShouldBeFalse();
     }
 
+    /// <summary>Verifies that read command error sets error status.</summary>
     [Fact]
     public async Task ReadCommand_Error_SetsErrorStatus()
     {
@@ -121,6 +131,7 @@ public class ReadWriteViewModelTests
         _vm.CurrentStatus.ShouldContain("Error");
     }
 
+    /// <summary>Verifies that clear resets all properties.</summary>
     [Fact]
     public void Clear_ResetsAllProperties()
     {
@@ -140,6 +151,7 @@ public class ReadWriteViewModelTests
         _vm.WriteStatus.ShouldBeNull();
     }
 
+    /// <summary>Verifies that IsNodeSelected tracks the selected node ID.</summary>
     [Fact]
     public void IsNodeSelected_TracksSelectedNodeId()
     {