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/StreamRelayTraceStampTests.cs

@@ -27,6 +27,7 @@ public class StreamRelayTraceStampTests : TestKit
         return evt!;
     }
 
+    /// <summary>Verifies that a traced change is stamped on the wire and parsed back.</summary>
     [Fact]
     public void TracedChange_IsStampedOnTheWire_AndParsedBack()
     {
@@ -43,6 +44,7 @@ public class StreamRelayTraceStampTests : TestKit
         Assert.True(back.Trace);
     }
 
+    /// <summary>Verifies that an unstamped change round-trips to null and false.</summary>
     [Fact]
     public void UnstampedChange_RoundTripsToNullAndFalse()
     {
@@ -57,6 +59,7 @@ public class StreamRelayTraceStampTests : TestKit
         Assert.False(back.Trace);
     }
 
+    /// <summary>Verifies that an older site frame without the trace fields parses to null and false.</summary>
     [Fact]
     public void OlderSiteFrame_WithoutTheFields_ParsesToNullAndFalse()
     {