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/SiteEventLogWriteFailuresMetricTests.cs

@@ -1,7 +1,7 @@
 namespace ZB.MOM.WW.ScadaBridge.HealthMonitoring.Tests;
 
 /// <summary>
-/// M2.16 (#30) regression coverage. <see cref="ISiteEventLogger.FailedWriteCount"/>
+/// Regression coverage. <see cref="ISiteEventLogger.FailedWriteCount"/>
 /// is a cumulative (point-in-time) counter. A periodic
 /// <c>SiteEventLogFailureCountReporter</c> hosted service polls the count and
 /// pushes it into the collector via
@@ -15,6 +15,7 @@ public class SiteEventLogWriteFailuresMetricTests
 {
     private readonly SiteHealthCollector _collector = new();
 
+    /// <summary>Verifies that a count that was set appears in the collected report.</summary>
     [Fact]
     public void Set_Then_CollectReport_IncludesCount()
     {
@@ -25,6 +26,7 @@ public class SiteEventLogWriteFailuresMetricTests
         Assert.Equal(17L, report.SiteEventLogWriteFailures);
     }
 
+    /// <summary>Verifies that the report payload includes the site event log write failure count, defaulting to zero.</summary>
     [Fact]
     public void Report_Payload_Includes_SiteEventLogWriteFailures_AsZeroByDefault()
     {
@@ -33,6 +35,7 @@ public class SiteEventLogWriteFailuresMetricTests
         Assert.Equal(0L, report.SiteEventLogWriteFailures);
     }
 
+    /// <summary>Verifies that collecting a report does not reset the site event log write failure count.</summary>
     [Fact]
     public void CollectReport_DoesNotReset_SiteEventLogWriteFailures()
     {
@@ -49,6 +52,7 @@ public class SiteEventLogWriteFailuresMetricTests
         Assert.Equal(42L, second.SiteEventLogWriteFailures);
     }
 
+    /// <summary>Verifies that setting the count overwrites the previous value.</summary>
     [Fact]
     public void Set_Overwrites_Previous_Value()
     {