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/HealthMetricsAuditWriteFailureCounterTests.cs

@@ -5,7 +5,7 @@ using ZB.MOM.WW.ScadaBridge.HealthMonitoring;
 namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Site;
 
 /// <summary>
-/// Bundle G (M2-T11) — the <see cref="HealthMetricsAuditWriteFailureCounter"/>
+/// The <see cref="HealthMetricsAuditWriteFailureCounter"/>
 /// adapter is the production binding for <see cref="IAuditWriteFailureCounter"/>
 /// on site nodes; it forwards every FallbackAuditWriter primary failure into
 /// the shared <see cref="ISiteHealthCollector"/> so the site health report
@@ -13,6 +13,7 @@ namespace ZB.MOM.WW.ScadaBridge.AuditLog.Tests.Site;
 /// </summary>
 public class HealthMetricsAuditWriteFailureCounterTests
 {
+    /// <summary>Verifies that a single increment is routed to the collector as a site audit write failure.</summary>
     [Fact]
     public void Increment_Routes_To_Collector_IncrementSiteAuditWriteFailures()
     {
@@ -24,6 +25,7 @@ public class HealthMetricsAuditWriteFailureCounterTests
         collector.Received(1).IncrementSiteAuditWriteFailures();
     }
 
+    /// <summary>Verifies that each of several increments is routed to the collector.</summary>
     [Fact]
     public void Increment_Multiple_Calls_Route_To_Collector_Each_Time()
     {
@@ -37,6 +39,7 @@ public class HealthMetricsAuditWriteFailureCounterTests
         collector.Received(3).IncrementSiteAuditWriteFailures();
     }
 
+    /// <summary>Verifies that constructing the counter with a null collector throws an <see cref="ArgumentNullException"/>.</summary>
     [Fact]
     public void Construction_With_Null_Collector_Throws_ArgumentNullException()
     {