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/AuditRedactionFailureMetricTests.cs

@@ -1,7 +1,7 @@
 namespace ZB.MOM.WW.ScadaBridge.HealthMonitoring.Tests;
 
 /// <summary>
-/// Bundle C (M5-T7) regression coverage. The canonical audit redactor
+/// Regression coverage: the canonical audit redactor
 /// (<see cref="ZB.MOM.WW.ScadaBridge.AuditLog.Redaction.ScadaBridgeAuditRedactor"/>) increments
 /// <see cref="ZB.MOM.WW.ScadaBridge.AuditLog.Payload.IAuditRedactionFailureCounter"/> every time
 /// a header/body/SQL-param redactor stage throws and the redactor has to
@@ -17,6 +17,7 @@ public class AuditRedactionFailureMetricTests
 {
     private readonly SiteHealthCollector _collector = new();
 
+    /// <summary>Verifies that incrementing the counter three times makes it report three.</summary>
     [Fact]
     public void Increment_Three_Times_Counter_Reports_3()
     {
@@ -29,6 +30,7 @@ public class AuditRedactionFailureMetricTests
         Assert.Equal(3, report.AuditRedactionFailure);
     }
 
+    /// <summary>Verifies that the report payload includes the audit redaction failure count as zero by default.</summary>
     [Fact]
     public void Report_Payload_Includes_AuditRedactionFailure_AsZeroByDefault()
     {