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.DataConnectionLayer.Tests/Adapters/OpcUaSecurityDowngradeTests.cs

@@ -3,6 +3,8 @@ using ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
 namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests.Adapters;
 public class OpcUaSecurityDowngradeTests
 {
+    /// <summary>Verifies that DC4: requested protection never falls back to none.</summary>
+    /// <param name="discoveryFails">The discovery fails.</param>
     [Theory]
     [InlineData(false)]
     [InlineData(true)]
@@ -13,6 +15,7 @@ public class OpcUaSecurityDowngradeTests
                 ? throw new Exception("discovery unavailable")
                 : new EndpointDescriptionCollection { new("opc.tcp://test:4840") { SecurityMode = MessageSecurityMode.None } }));
     }
+    /// <summary>Verifies that DC4: exact requested mode is selected.</summary>
     [Fact]
     public void DC4_ExactRequestedModeIsSelected()
     {