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.NotificationOutbox.Tests/TestSupport/NoOpCentralAuditWriter.cs

@@ -5,11 +5,12 @@ namespace ZB.MOM.WW.ScadaBridge.NotificationOutbox.Tests.TestSupport;
 
 /// <summary>
 /// Test-only no-op <see cref="ICentralAuditWriter"/>. Used by existing
-/// NotificationOutboxActor TestKit fixtures whose tests pre-date the M4 Bundle B
+/// NotificationOutboxActor TestKit fixtures whose tests pre-date the
 /// audit-writer injection — they don't care about audit emission, they just
 /// need a non-null collaborator so the actor's constructor succeeds.
 /// </summary>
 internal sealed class NoOpCentralAuditWriter : ICentralAuditWriter
 {
+    /// <inheritdoc />
     public Task WriteAsync(AuditEvent evt, CancellationToken ct = default) => Task.CompletedTask;
 }