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/SecretMirrorStatusHealthFieldTests.cs

@@ -3,17 +3,19 @@ using ZB.MOM.WW.ScadaBridge.Commons.Messages.Health;
 namespace ZB.MOM.WW.ScadaBridge.HealthMonitoring.Tests;
 
 /// <summary>
-/// Review finding M1 — <c>SiteHealthReport.SecretMirrorStatuses</c> carries every site node's
+/// <c>SiteHealthReport.SecretMirrorStatuses</c> carries every site node's
 /// deployed-secrets mirror failures (the standby's included) on the active node's report.
 /// </summary>
 public class SecretMirrorStatusHealthFieldTests
 {
+    /// <summary>Verifies that a report collected before any status was supplied leaves the field null.</summary>
     [Fact]
     public void CollectReport_NeverTold_LeavesTheFieldNull()
     {
         Assert.Null(new SiteHealthCollector().CollectReport("TestSite").SecretMirrorStatuses);
     }
 
+    /// <summary>Verifies that a collected report carries the latest snapshot without draining it.</summary>
     [Fact]
     public void CollectReport_CarriesTheLatestSnapshot_AndDoesNotDrainIt()
     {
@@ -33,6 +35,7 @@ public class SecretMirrorStatusHealthFieldTests
         Assert.Equal("S1", Assert.Single(first[1].Failures).SecretName);
     }
 
+    /// <summary>Verifies that setting the status to null resets the field to no data.</summary>
     [Fact]
     public void SetNull_ResetsToNoData()
     {