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.Communication.Tests/Grpc/CleanupVerificationTests.cs

@@ -17,6 +17,8 @@ namespace ZB.MOM.WW.ScadaBridge.Communication.Tests.Grpc;
 [Collection("SiteStreamSubscriberGauge")]
 public class CleanupVerificationTests : TestKit
 {
+    /// <summary>Verifies that cancelling a stream cleans up its site stream manager subscription.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Stream_Cancellation_CleansUp_SiteStreamManager_Subscription()
     {
@@ -71,6 +73,8 @@ public class CleanupVerificationTests : TestKit
         subscriber.Received(1).RemoveSubscriber(subscribedActor!);
     }
 
+    /// <summary>Verifies that cancelling several streams cleans up all of their subscriptions.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Multiple_Streams_Cancelled_AllCleanedUp()
     {