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.Host.Tests/RequiredSingletonsHealthCheckTests.cs

@@ -8,7 +8,7 @@ using ZB.MOM.WW.ScadaBridge.Host.Health;
 namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
 
 /// <summary>
-/// M2.14 (#28): unit tests for <see cref="RequiredSingletonsHealthCheck"/>.
+/// Unit tests for <see cref="RequiredSingletonsHealthCheck"/>.
 ///
 /// The check probes each required central singleton through its local
 /// <c>ClusterSingletonProxy</c> by Asking an <see cref="Identify"/> with a short
@@ -52,6 +52,8 @@ public class RequiredSingletonsHealthCheckTests : TestKit
         return await check.CheckHealthAsync(context, CancellationToken.None);
     }
 
+    /// <summary>Verifies all required singleton proxies reachable reports healthy.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task AllRequiredSingletonProxiesReachable_ReportsHealthy()
     {
@@ -71,6 +73,8 @@ public class RequiredSingletonsHealthCheckTests : TestKit
         Assert.Equal(HealthStatus.Healthy, result.Status);
     }
 
+    /// <summary>Verifies that an unreachable required singleton makes the check report unhealthy and name it.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task OneRequiredSingletonUnreachable_ReportsUnhealthyNamingIt()
     {
@@ -95,6 +99,8 @@ public class RequiredSingletonsHealthCheckTests : TestKit
         Assert.Contains(missing, result.Description!);
     }
 
+    /// <summary>Verifies that an actor system that is not yet available makes the check report unhealthy without throwing.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ActorSystemNotYetAvailable_ReportsUnhealthy_DoesNotThrow()
     {
@@ -111,6 +117,8 @@ public class RequiredSingletonsHealthCheckTests : TestKit
         Assert.Equal(HealthStatus.Unhealthy, result.Status);
     }
 
+    /// <summary>Verifies that an already-cancelled token makes the check report unhealthy without throwing.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task PreCancelledToken_ReportsUnhealthy_DoesNotThrow()
     {