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.NotificationService.Tests/SmtpErrorClassifierTests.cs

@@ -5,7 +5,7 @@ using MailKit.Net.Smtp;
 namespace ZB.MOM.WW.ScadaBridge.NotificationService.Tests;
 
 /// <summary>
-/// NS-002/NS-003: Tests for the shared SMTP error classification policy. This
+/// Tests for the shared SMTP error classification policy. This
 /// policy is correctness-relevant — it decides whether a delivery failure is
 /// retried (transient) or returned to the caller (permanent) — and is shared
 /// by the central outbox's <c>EmailNotificationDeliveryAdapter</c>, so it
@@ -13,6 +13,8 @@ namespace ZB.MOM.WW.ScadaBridge.NotificationService.Tests;
 /// </summary>
 public class SmtpErrorClassifierTests
 {
+    /// <summary>Verifies that an SMTP 4xx command error is classified as transient.</summary>
+    /// <param name="statusCode">The SMTP status code.</param>
     [Theory]
     [InlineData(421)] // service not available
     [InlineData(450)] // mailbox unavailable (busy)
@@ -26,6 +28,8 @@ public class SmtpErrorClassifierTests
         Assert.Equal(SmtpErrorClass.Transient, SmtpErrorClassifier.Classify(ex, CancellationToken.None));
     }
 
+    /// <summary>Verifies that an SMTP 5xx command error is classified as permanent.</summary>
+    /// <param name="statusCode">The SMTP status code.</param>
     [Theory]
     [InlineData(500)] // syntax error
     [InlineData(550)] // mailbox unavailable (rejected)
@@ -39,6 +43,7 @@ public class SmtpErrorClassifierTests
         Assert.Equal(SmtpErrorClass.Permanent, SmtpErrorClassifier.Classify(ex, CancellationToken.None));
     }
 
+    /// <summary>Verifies that an SMTP command error with an unusual status code is classified as unknown.</summary>
     [Fact]
     public void Classify_SmtpCommandWithUnusualCode_IsUnknown()
     {
@@ -49,6 +54,7 @@ public class SmtpErrorClassifierTests
         Assert.Equal(SmtpErrorClass.Unknown, SmtpErrorClassifier.Classify(ex, CancellationToken.None));
     }
 
+    /// <summary>Verifies that an SMTP protocol exception is classified as transient.</summary>
     [Fact]
     public void Classify_SmtpProtocolException_IsTransient()
     {
@@ -57,6 +63,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new SmtpProtocolException("protocol error"), CancellationToken.None));
     }
 
+    /// <summary>Verifies that a service-not-connected exception is classified as transient.</summary>
     [Fact]
     public void Classify_ServiceNotConnectedException_IsTransient()
     {
@@ -65,6 +72,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new ServiceNotConnectedException(), CancellationToken.None));
     }
 
+    /// <summary>Verifies that a socket exception is classified as transient.</summary>
     [Fact]
     public void Classify_SocketException_IsTransient()
     {
@@ -73,6 +81,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new SocketException(), CancellationToken.None));
     }
 
+    /// <summary>Verifies that a timeout exception is classified as transient.</summary>
     [Fact]
     public void Classify_TimeoutException_IsTransient()
     {
@@ -81,6 +90,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new TimeoutException(), CancellationToken.None));
     }
 
+    /// <summary>Verifies that a requested cancellation is classified as unknown.</summary>
     [Fact]
     public void Classify_RequestedCancellation_IsUnknown()
     {
@@ -92,6 +102,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new OperationCanceledException(), cts.Token));
     }
 
+    /// <summary>Verifies that an operation cancellation without a requested cancellation is classified as unknown.</summary>
     [Fact]
     public void Classify_OperationCanceledWithoutRequestedCancellation_IsUnknown()
     {
@@ -101,6 +112,7 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new OperationCanceledException(), CancellationToken.None));
     }
 
+    /// <summary>Verifies that an unrecognised exception is classified as unknown.</summary>
     [Fact]
     public void Classify_UnrecognisedException_IsUnknown()
     {
@@ -109,6 +121,9 @@ public class SmtpErrorClassifierTests
             SmtpErrorClassifier.Classify(new InvalidOperationException("bad credential triple"), CancellationToken.None));
     }
 
+    /// <summary>Verifies that the transient check matches the classification of the status code.</summary>
+    /// <param name="statusCode">The SMTP status code.</param>
+    /// <param name="expectedTransient">Whether the status code is expected to be transient.</param>
     [Theory]
     [InlineData(450, true)]
     [InlineData(550, false)]
@@ -121,6 +136,7 @@ public class SmtpErrorClassifierTests
         Assert.Equal(expectedTransient, SmtpErrorClassifier.IsTransient(ex, CancellationToken.None));
     }
 
+    /// <summary>Verifies that a requested cancellation is not transient.</summary>
     [Fact]
     public void IsTransient_RequestedCancellation_IsFalse()
     {