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.HealthMonitoring.Tests/SiteEventLogFailureCountReporterTests.cs

@@ -3,17 +3,19 @@ using Microsoft.Extensions.Logging.Abstractions;
 namespace ZB.MOM.WW.ScadaBridge.HealthMonitoring.Tests;
 
 /// <summary>
-/// M2.16 (#30) — unit tests for <see cref="SiteEventLogFailureCountReporter"/>.
+/// Unit tests for <see cref="SiteEventLogFailureCountReporter"/>.
 /// Verifies that the poller reads the count provided by the
 /// <see cref="Func{TResult}"/> delegate and pushes it into
 /// <see cref="ISiteHealthCollector.SetSiteEventLogWriteFailures"/>.
 /// </summary>
 public class SiteEventLogFailureCountReporterTests
 {
+    /// <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: 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.
@@ -31,6 +33,8 @@ public class SiteEventLogFailureCountReporterTests
         reporter.Dispose();
     }
 
+    /// <summary>Verifies that starting the reporter immediately probes the failed-write count.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StartAsync_ImmediatelyProbes_FailedWriteCount()
     {
@@ -61,6 +65,8 @@ public class SiteEventLogFailureCountReporterTests
         await reporter.StopAsync(CancellationToken.None);
     }
 
+    /// <summary>Verifies that the reporter pushes the latest failed-write count on each tick.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StartAsync_PushesLatestCount_OnEachTick()
     {