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/BrowseTreeViewModelTests.cs

@@ -7,12 +7,14 @@ using BrowseResult = ZB.MOM.WW.OtOpcUa.Client.Shared.Models.BrowseResult;
 
 namespace ZB.MOM.WW.OtOpcUa.Client.UI.Tests;
 
+/// <summary>Tests for the BrowseTreeViewModel class.</summary>
 public class BrowseTreeViewModelTests
 {
     private readonly SynchronousUiDispatcher _dispatcher;
     private readonly FakeOpcUaClientService _service;
     private readonly BrowseTreeViewModel _vm;
 
+    /// <summary>Initializes a new instance of the BrowseTreeViewModelTests class.</summary>
     public BrowseTreeViewModelTests()
     {
         _service = new FakeOpcUaClientService
@@ -27,6 +29,7 @@ public class BrowseTreeViewModelTests
         _vm = new BrowseTreeViewModel(_service, _dispatcher);
     }
 
+    /// <summary>Verifies that LoadRootsAsync populates root nodes.</summary>
     [Fact]
     public async Task LoadRootsAsync_PopulatesRootNodes()
     {
@@ -37,6 +40,7 @@ public class BrowseTreeViewModelTests
         _vm.RootNodes[1].DisplayName.ShouldBe("Node2");
     }
 
+    /// <summary>Verifies that LoadRootsAsync browses with null parent.</summary>
     [Fact]
     public async Task LoadRootsAsync_BrowsesWithNullParent()
     {
@@ -46,6 +50,7 @@ public class BrowseTreeViewModelTests
         _service.LastBrowseParentNodeId.ShouldBeNull();
     }
 
+    /// <summary>Verifies that Clear removes all root nodes.</summary>
     [Fact]
     public void Clear_RemovesAllRootNodes()
     {
@@ -55,6 +60,7 @@ public class BrowseTreeViewModelTests
         _vm.RootNodes.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that nodes with children have a placeholder.</summary>
     [Fact]
     public async Task LoadRootsAsync_NodeWithChildren_HasPlaceholder()
     {
@@ -66,6 +72,7 @@ public class BrowseTreeViewModelTests
         nodeWithChildren.Children[0].IsPlaceholder.ShouldBeTrue();
     }
 
+    /// <summary>Verifies that nodes without children have no placeholder.</summary>
     [Fact]
     public async Task LoadRootsAsync_NodeWithoutChildren_HasNoPlaceholder()
     {
@@ -76,6 +83,7 @@ public class BrowseTreeViewModelTests
         leafNode.Children.ShouldBeEmpty();
     }
 
+    /// <summary>Verifies that first tree node expand triggers child browse.</summary>
     [Fact]
     public async Task TreeNode_FirstExpand_TriggersChildBrowse()
     {
@@ -105,6 +113,7 @@ public class BrowseTreeViewModelTests
         parent.Children[0].DisplayName.ShouldBe("Child1");
     }
 
+    /// <summary>Verifies that second tree node expand does not browse again.</summary>
     [Fact]
     public async Task TreeNode_SecondExpand_DoesNotBrowseAgain()
     {
@@ -133,6 +142,7 @@ public class BrowseTreeViewModelTests
         _service.BrowseCallCount.ShouldBe(browseCountAfterFirst);
     }
 
+    /// <summary>Verifies that IsLoading transitions during browse.</summary>
     [Fact]
     public async Task TreeNode_IsLoading_TransitionsDuringBrowse()
     {