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/NotificationOutboxActorAuditInjectionTests.cs

@@ -11,7 +11,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
 namespace ZB.MOM.WW.ScadaBridge.NotificationOutbox.Tests;
 
 /// <summary>
-/// M4 Bundle B (B1) — verifies <see cref="NotificationOutboxActor"/> accepts an
+/// Verifies <see cref="NotificationOutboxActor"/> accepts an
 /// <see cref="ICentralAuditWriter"/> at construction so subsequent bundle tasks
 /// (B2/B3) can route attempt + terminal lifecycle events through the central
 /// direct-write audit path.
@@ -32,8 +32,10 @@ public class NotificationOutboxActorAuditInjectionTests : TestKit
     /// </summary>
     private sealed class RecordingCentralAuditWriter : ICentralAuditWriter
     {
+        /// <summary>Gets the audit events recorded by this writer.</summary>
         public List<AuditEvent> Events { get; } = new();
 
+        /// <inheritdoc />
         public Task WriteAsync(AuditEvent evt, CancellationToken ct = default)
         {
             lock (Events)
@@ -44,6 +46,7 @@ public class NotificationOutboxActorAuditInjectionTests : TestKit
         }
     }
 
+    /// <summary>Verifies that the actor can be constructed with an audit writer without throwing.</summary>
     [Fact]
     public void Actor_ConstructedWith_ICentralAuditWriter_NoException()
     {
@@ -65,6 +68,7 @@ public class NotificationOutboxActorAuditInjectionTests : TestKit
         }
     }
 
+    /// <summary>Verifies that constructing the actor with a null audit writer throws.</summary>
     [Fact]
     public void Actor_NullAuditWriter_Throws()
     {