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.PerformanceTests/Streaming/SiteStreamThroughputTests.cs

@@ -36,6 +36,7 @@ public class SiteStreamThroughputTests
     {
         public static long Received;
 
+        /// <summary>Initializes the actor and registers the handlers that count received attribute value changes.</summary>
         public CountingActor()
         {
             // The manager Tells the raw ISiteStreamEvent record (AttributeValueChanged)
@@ -45,6 +46,8 @@ public class SiteStreamThroughputTests
         }
     }
 
+    /// <summary>Verifies that the site stream sustains at least 10,000 events per second to a single subscriber.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Trait("Category", "Performance")]
     [Fact]
     public async Task SiteStream_SustainsAtLeast10kEventsPerSecond_ToOneSubscriber()