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.AuditLog.Tests/Site/SiteAuditBacklogReporterCadenceTests.cs

@@ -11,7 +11,7 @@ using ZB.MOM.WW.ScadaBridge.HealthMonitoring;
 namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Site;
 
 /// <summary>
-/// Deferred-work #21: the backlog reporter's poll cadence is configurable via
+/// The backlog reporter's poll cadence is configurable via
 /// <see cref="SqliteAuditWriterOptions.BacklogPollIntervalSeconds"/> instead of the
 /// old hard-coded 30 s constant.
 /// </summary>
@@ -26,6 +26,8 @@ public class SiteAuditBacklogReporterCadenceTests
             explicitInterval,
             options);
 
+    /// <summary>Verifies that stopping the reporter while a probe is in flight lets the loop complete cleanly.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StopAsync_WhileProbeInFlight_LoopCompletesCleanly()
     {
@@ -62,10 +64,12 @@ public class SiteAuditBacklogReporterCadenceTests
         throw new UnreachableException("the delay above always throws on cancellation");
     }
 
+    /// <summary>Verifies that stopping the reporter after it has been disposed does not throw.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StopAsync_AfterDispose_DoesNotThrow()
     {
-        // Regression (Gitea #15 follow-up): Dispose tears down the CTS StopAsync
+        // Regression (follow-up): Dispose tears down the CTS StopAsync
         // cancels, and the host does not guarantee StopAsync is driven before the DI
         // container is disposed. Cancel() on a disposed CTS throws, and letting that
         // escape an IHostedService aborts the host's whole shutdown sequence.
@@ -79,6 +83,7 @@ public class SiteAuditBacklogReporterCadenceTests
         reporter.Dispose();
     }
 
+    /// <summary>Verifies that the poll cadence comes from the options when one is configured.</summary>
     [Fact]
     public void Cadence_ComesFromOptions_WhenConfigured()
     {
@@ -89,6 +94,7 @@ public class SiteAuditBacklogReporterCadenceTests
         Assert.Equal(TimeSpan.FromSeconds(12), reporter.RefreshInterval);
     }
 
+    /// <summary>Verifies that a non-positive configured interval falls back to the default cadence.</summary>
     [Fact]
     public void Cadence_FallsBackToDefault_WhenOptionsNonPositive()
     {
@@ -99,6 +105,7 @@ public class SiteAuditBacklogReporterCadenceTests
         Assert.Equal(SiteAuditBacklogReporter.DefaultRefreshInterval, reporter.RefreshInterval);
     }
 
+    /// <summary>Verifies that the default cadence is used when no options are supplied.</summary>
     [Fact]
     public void Cadence_FallsBackToDefault_WhenNoOptions()
     {
@@ -107,6 +114,7 @@ public class SiteAuditBacklogReporterCadenceTests
         Assert.Equal(SiteAuditBacklogReporter.DefaultRefreshInterval, reporter.RefreshInterval);
     }
 
+    /// <summary>Verifies that an explicitly supplied interval takes precedence over the options value.</summary>
     [Fact]
     public void ExplicitInterval_WinsOverOptions()
     {
@@ -119,6 +127,7 @@ public class SiteAuditBacklogReporterCadenceTests
 
     // ----- Stale-Pending signal (review F5) ----- //
 
+    /// <summary>Verifies that a stale pending backlog is logged as a warning and that repeat warnings are then rate-limited.</summary>
     [Fact]
     public void StalePendingBacklog_IsWarned_ThenRateLimited()
     {
@@ -143,6 +152,7 @@ public class SiteAuditBacklogReporterCadenceTests
         Assert.Contains("pending", warning.Message, StringComparison.OrdinalIgnoreCase);
     }
 
+    /// <summary>Verifies that a fresh or empty pending backlog does not log a warning.</summary>
     [Fact]
     public void FreshOrEmptyPendingBacklog_IsNotWarned()
     {
@@ -163,12 +173,27 @@ public class SiteAuditBacklogReporterCadenceTests
     /// <summary>Captures log entries so the stale-pending signal can be asserted.</summary>
     private sealed class CapturingLogger : ILogger<SiteAuditBacklogReporter>
     {
+        /// <summary>Gets the log entries captured so far.</summary>
         public List<(LogLevel Level, Exception? Exception, string Message)> Entries { get; } = new();
 
+        /// <summary>Returns no scope; the fake logger does not track scopes.</summary>
+        /// <typeparam name="TState">The type of the scope state.</typeparam>
+        /// <param name="state">The scope state, ignored.</param>
+        /// <returns>Always null or a no-op scope.</returns>
         public IDisposable? BeginScope<TState>(TState state) where TState : notnull => null;
 
+        /// <summary>Reports every log level as enabled.</summary>
+        /// <param name="logLevel">The log level being queried.</param>
+        /// <returns>Always true.</returns>
         public bool IsEnabled(LogLevel logLevel) => true;
 
+        /// <summary>Records the log entry for later assertions.</summary>
+        /// <typeparam name="TState">The type of the log state.</typeparam>
+        /// <param name="logLevel">The severity of the entry.</param>
+        /// <param name="eventId">The event identifier.</param>
+        /// <param name="state">The log state.</param>
+        /// <param name="exception">The associated exception, if any.</param>
+        /// <param name="formatter">Formats the state and exception into the message.</param>
         public void Log<TState>(
             LogLevel logLevel,
             EventId eventId,