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/InstanceActorTraceArmTests.cs

@@ -31,6 +31,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
     private readonly SharedScriptLibrary _sharedScriptLibrary;
     private readonly TestLocalDb _localDb;
 
+    /// <summary>Initializes the test with a temporary site database and the script services.</summary>
     public InstanceActorTraceArmTests()
     {
         _localDb = TestLocalDb.CreateTemp("instance-tracearm-test");
@@ -40,6 +41,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
         _sharedScriptLibrary = new SharedScriptLibrary(_compilationService, NullLogger<SharedScriptLibrary>.Instance);
     }
 
+    /// <inheritdoc />
     void IDisposable.Dispose()
     {
         Shutdown();
@@ -107,6 +109,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
             m => m.AttributeName == "Processed" && Equals(m.Value, value), TimeSpan.FromSeconds(10));
     }
 
+    /// <summary>Verifies that a traced data write followed by its echo publishes a change stamped with the source and trace.</summary>
     [Fact]
     public void TracedDataWrite_ThenEcho_PublishesChangeStampedWithSourceAndTrace()
     {
@@ -122,6 +125,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
         Assert.True(published.SourceExecutionInferred);
     }
 
+    /// <summary>Verifies that an untraced data write followed by its echo publishes an unstamped change.</summary>
     [Fact]
     public void UntracedDataWrite_ThenEcho_PublishesUnstampedChange()
     {
@@ -183,6 +187,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
         Assert.True(published.Trace);
     }
 
+    /// <summary>Verifies that the trace arm is consumed only once.</summary>
     [Fact]
     public void Arm_IsConsumedOnce()
     {
@@ -199,6 +204,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
         Assert.False(second.Trace);
     }
 
+    /// <summary>Verifies that an expired trace arm is ignored.</summary>
     [Fact]
     [Trait("Category", "Slow")]
     public void Arm_Expired_IsIgnored()
@@ -213,6 +219,7 @@ public class InstanceActorTraceArmTests : TestKit, IDisposable
         Assert.False(published.Trace);
     }
 
+    /// <summary>Verifies that a traced static write publishes the trace flag.</summary>
     [Fact]
     public void StaticWrite_Traced_PublishesTraceFlag()
     {