docs(tests): fix CommentChecker findings across tests/ — 13,392 → 0 (repo-wide scan clean)

Comment/XML-doc changes only:
- add summaries to ~10k test methods, fixtures, fakes and helpers
  (+ <param> on theories, <returns> on async Task methods,
  <inheritdoc/> on interface implementations the checker can resolve)
- strip ~2.6k project-tracking references (WP*, P*-*, row-NN, Task N,
  #NN, Component-0NN) from comments, keeping the explanatory text;
  reword false positives in comments only
- real docs on fakes implementing BCL/library interfaces
  (IDisposable, ILogger, IOptionsMonitor, IAsyncLifetime)
- reword the last 5 src/ false positives (CWE-1236, failures-1,
  year-0001, M365)

Only non-comment edits: four one-line nested classes split across lines
so members can carry docs. Build 0 errors / 0 warnings.

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/TreeViewMultiSelectTests.cs

@@ -62,6 +62,7 @@ public class TreeViewMultiSelectTests : BunitContext
         });
     }
 
+    /// <summary>Verifies that checkbox mode renders a checkbox input for each node.</summary>
     [Fact]
     public void Checkbox_mode_renders_input_checkbox_per_node()
     {
@@ -72,6 +73,7 @@ public class TreeViewMultiSelectTests : BunitContext
         Assert.Equal(5, checkboxes.Count);
     }
 
+    /// <summary>Verifies that clicking a folder checkbox selects all of its descendant leaves.</summary>
     [Fact]
     public void Clicking_folder_checkbox_selects_all_descendant_leaves()
     {
@@ -80,7 +82,7 @@ public class TreeViewMultiSelectTests : BunitContext
             selectedKeys: new HashSet<object>(),
             onSelectedKeysChanged: keys => captured = keys);
 
-        // First checkbox is Folder1 (root #1). It has leaves l1a + l1b.
+        // First checkbox is Folder1 (the first root). It has leaves l1a + l1b.
         var folderCheckbox = cut.FindAll("input.tv-checkbox")[0];
         folderCheckbox.Change(true);
 
@@ -90,6 +92,7 @@ public class TreeViewMultiSelectTests : BunitContext
         Assert.Contains((object)"l1b", captured);
     }
 
+    /// <summary>Verifies that clicking a leaf makes its parent indeterminate when a sibling is unchecked.</summary>
     [Fact]
     public void Clicking_leaf_makes_parent_indeterminate_when_sibling_unchecked()
     {
@@ -110,6 +113,7 @@ public class TreeViewMultiSelectTests : BunitContext
         Assert.NotEqual("true", folderCheckbox.GetAttribute("checked"));
     }
 
+    /// <summary>Verifies that single selection mode behaves as before.</summary>
     [Fact]
     public void Single_mode_unchanged()
     {