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.ClusterInfrastructure.Tests/ServiceCollectionExtensionsTests.cs

@@ -4,14 +4,15 @@ using Microsoft.Extensions.Options;
 namespace ZB.MOM.WW.ScadaBridge.ClusterInfrastructure.Tests;
 
 /// <summary>
-/// CI-002: Tests that <see cref="ServiceCollectionExtensions.AddClusterInfrastructure"/>
+/// Tests that <see cref="ServiceCollectionExtensions.AddClusterInfrastructure"/>
 /// does real work rather than silently returning success — it must register
 /// the <see cref="ClusterOptionsValidator"/> so misconfiguration fails fast.
 /// (The companion actor-registration test was removed alongside the deleted
-/// `AddClusterInfrastructureActors` extension method — see ClusterInfra-014.)
+/// `AddClusterInfrastructureActors` extension method.)
 /// </summary>
 public class ServiceCollectionExtensionsTests
 {
+    /// <summary>Verifies the case: add Cluster Infrastructure, registers Options Validator.</summary>
     [Fact]
     public void AddClusterInfrastructure_RegistersOptionsValidator()
     {
@@ -29,6 +30,7 @@ public class ServiceCollectionExtensionsTests
         Assert.IsType<ClusterOptionsValidator>(validator);
     }
 
+    /// <summary>Verifies the case: add Cluster Infrastructure, validator Rejects Bad Options At Resolution.</summary>
     [Fact]
     public void AddClusterInfrastructure_ValidatorRejectsBadOptionsAtResolution()
     {
@@ -48,7 +50,7 @@ public class ServiceCollectionExtensionsTests
         Assert.Contains("MinNrOfMembers", ex.Message);
     }
 
-    // ClusterInfra-014: `AddClusterInfrastructureActors_ThrowsRatherThanSilentlySucceeding`
+    // `AddClusterInfrastructureActors_ThrowsRatherThanSilentlySucceeding`
     // was removed alongside the now-deleted `AddClusterInfrastructureActors`
     // extension method. The Akka.NET actor wiring legitimately lives in
     // `ZB.MOM.WW.ScadaBridge.Host` (AkkaHostedService) per the