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.Commons.Tests/Interfaces/Services/ExternalCallResultTests.cs

@@ -3,7 +3,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
 namespace ZB.MOM.WW.ScadaBridge.Commons.Tests.Interfaces.Services;
 
 /// <summary>
-/// Tests for <see cref="ExternalCallResult"/>, in particular the Commons-021
+/// Tests for <see cref="ExternalCallResult"/>, in particular the
 /// thread-safe lazy parse of <c>Response</c>. The pre-fix implementation used
 /// two mutable fields (<c>_response</c>/<c>_responseParsed</c>) with no
 /// synchronization, so concurrent readers could each construct a fresh
@@ -14,6 +14,7 @@ namespace ZB.MOM.WW.ScadaBridge.Commons.Tests.Interfaces.Services;
 /// </summary>
 public class ExternalCallResultTests
 {
+    /// <summary>Verifies that a null or empty response JSON yields a null response.</summary>
     [Fact]
     public void Response_NullOrEmptyJson_ReturnsNull()
     {
@@ -24,6 +25,7 @@ public class ExternalCallResultTests
         Assert.Null(withEmpty.Response);
     }
 
+    /// <summary>Verifies that the response JSON is parsed into a dynamic element.</summary>
     [Fact]
     public void Response_ParsesJsonIntoDynamicElement()
     {
@@ -37,7 +39,7 @@ public class ExternalCallResultTests
     }
 
     /// <summary>
-    /// Commons-021: concurrent readers must observe the same parsed instance
+    /// Concurrent readers must observe the same parsed instance
     /// (a `Lazy&lt;T&gt;` invariant). Under the pre-fix code two threads could
     /// both produce a fresh `DynamicJsonElement` and one would win the race —
     /// `ReferenceEquals` would then occasionally fail. With the fix every