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.Communication.Tests/CentralCommunicationActorTests.cs

@@ -26,6 +26,7 @@ namespace ZB.MOM.WW.ScadaBridge.Communication.Tests;
 /// </summary>
 public class CentralCommunicationActorTests : TestKit
 {
+    /// <summary>Initializes a new instance of the <see cref="CentralCommunicationActorTests"/> class with debug-level Akka logging.</summary>
     public CentralCommunicationActorTests() : base(@"akka.loglevel = DEBUG") { }
 
     private (IActorRef actor, ISiteRepository mockRepo) CreateActorWithMockRepo(
@@ -44,6 +45,7 @@ public class CentralCommunicationActorTests : TestKit
         return (actor, mockRepo);
     }
 
+    /// <summary>Verifies that a heartbeat bumps the aggregator timestamp for the site.</summary>
     [Fact]
     public void Heartbeat_BumpsAggregatorTimestamp()
     {
@@ -68,10 +70,11 @@ public class CentralCommunicationActorTests : TestKit
         AwaitAssert(() => aggregator.Received(1).MarkHeartbeat("site1", timestamp));
     }
 
+    /// <summary>Verifies that a replicated heartbeat marks the local aggregator without being rebroadcast.</summary>
     [Fact]
     public void HeartbeatReplica_MarksLocalAggregator_WithoutRebroadcast()
     {
-        // Task 16 (arch review 02): a heartbeat replicated from the peer central
+        // A heartbeat replicated from the peer central
         // node marks the local aggregator (so post-failover both nodes know the
         // site's liveness) but is NOT re-published (it arrives via pub-sub already).
         var mockRepo = Substitute.For<ISiteRepository>();
@@ -95,10 +98,11 @@ public class CentralCommunicationActorTests : TestKit
         AwaitAssert(() => aggregator.Received(1).MarkHeartbeat("site-1", ts));
     }
 
+    /// <summary>Verifies that a failure loading site addresses is logged rather than silently swallowed.</summary>
     [Fact]
     public void LoadSiteAddressesFailure_IsLoggedNotSilentlySwallowed()
     {
-        // Regression test for Communication-006. When the repository query throws,
+        // Regression test: when the repository query throws,
         // PipeTo delivers a Status.Failure to the actor. Without a Receive<Status.Failure>
         // handler the failure becomes an unhandled message (debug-level only) and the
         // periodic refresh fails silently — operators cannot tell "no addresses
@@ -123,6 +127,7 @@ public class CentralCommunicationActorTests : TestKit
     private NotificationSubmit CreateSubmit(string id = "notif1") =>
         new(id, "ops-list", "Subject", "Body", "site1", "inst1", "script.cs", DateTimeOffset.UtcNow);
 
+    /// <summary>Verifies that a notification submit is forwarded to the outbox proxy and the ack is routed back to the site.</summary>
     [Fact]
     public void NotificationSubmit_ForwardedToOutboxProxy_AckRoutesBackToSite()
     {
@@ -142,6 +147,7 @@ public class CentralCommunicationActorTests : TestKit
         siteProbe.ExpectMsg<NotificationSubmitAck>(a => a.NotificationId == "notif1" && a.Accepted);
     }
 
+    /// <summary>Verifies that a notification status query is forwarded to the outbox proxy and the response is routed back to the site.</summary>
     [Fact]
     public void NotificationStatusQuery_ForwardedToOutboxProxy_ResponseRoutesBackToSite()
     {
@@ -160,6 +166,7 @@ public class CentralCommunicationActorTests : TestKit
         siteProbe.ExpectMsg<NotificationStatusResponse>(r => r.CorrelationId == "corr1" && r.Found);
     }
 
+    /// <summary>Verifies that a notification submit with no outbox configured replies with a non-accepted ack.</summary>
     [Fact]
     public void NotificationSubmit_NoOutboxConfigured_RepliesNonAccepted()
     {
@@ -175,6 +182,7 @@ public class CentralCommunicationActorTests : TestKit
         Assert.NotNull(ack.Error);
     }
 
+    /// <summary>Verifies that a notification status query with no outbox configured replies with a not-found response.</summary>
     [Fact]
     public void NotificationStatusQuery_NoOutboxConfigured_RepliesNotFound()
     {