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.SiteRuntime.Tests/Actors/InstanceActorWaitForAttributeTests.cs

@@ -29,6 +29,7 @@ public class InstanceActorWaitForAttributeTests : TestKit, IDisposable
     private readonly SiteRuntimeOptions _options;
     private readonly TestLocalDb _localDb;
 
+    /// <summary>Initializes a new instance of the <c>InstanceActorWaitForAttributeTests</c> class.</summary>
     public InstanceActorWaitForAttributeTests()
     {
         _localDb = TestLocalDb.CreateTemp("instance-waitfor-test");
@@ -56,6 +57,7 @@ public class InstanceActorWaitForAttributeTests : TestKit, IDisposable
             NullLogger<InstanceActor>.Instance)));
     }
 
+    /// <inheritdoc />
     void IDisposable.Dispose()
     {
         // TestKit teardown first, so no in-flight actor can reach a disposed ILocalDb;
@@ -474,7 +476,7 @@ public class InstanceActorWaitForAttributeTests : TestKit, IDisposable
         // The pending length>=3 waiter must NOT fire on this non-change republish.
         ExpectNoMsg(TimeSpan.FromMilliseconds(500));
 
-        // A REAL change to a length-3 list resolves the still-pending waiter.
+        // A REAL change to a three-element list resolves the still-pending waiter.
         actor.Tell(new TagValueUpdate("PLC", tag, new[] { 7, 8, 9 }, QualityCode.Good, DateTimeOffset.UtcNow));
         var realChange = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
         Assert.Equal("wfa-len3", realChange.CorrelationId);