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.Host.Tests/UnexpectedTerminationTests.cs

@@ -11,7 +11,7 @@ using ZB.MOM.WW.ScadaBridge.Host.Actors;
 namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
 
 /// <summary>
-/// PLAN-01 Task 20 (review 01 underdeveloped #2): with SBR down-if-alone +
+/// With SBR down-if-alone +
 /// run-coordinated-shutdown-when-down live, a self-downed node terminates its
 /// ActorSystem out from under the still-running Host process. Unless the process
 /// then exits, the node idles forever — serving nothing, restarted by nobody.
@@ -53,6 +53,8 @@ public sealed class UnexpectedTerminationTests
             lifetime);
     }
 
+    /// <summary>Verifies that the host application is stopped when the actor system terminates outside of a stop request.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ActorSystemTerminatedOutsideStopAsync_StopsHostApplication()
     {
@@ -69,6 +71,8 @@ public sealed class UnexpectedTerminationTests
         lifetime.Received(1).StopApplication();
     }
 
+    /// <summary>Verifies that a normal stop does not trigger an application stop.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StopAsync_DoesNotTriggerStopApplication()
     {