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.Commons.Tests/Messages/MessageConventionTests.cs

@@ -17,6 +17,7 @@ public class MessageConventionTests
                         && !t.Name.StartsWith("<") // exclude compiler-generated types
                         && (t.IsClass || (t.IsValueType && !t.IsPrimitive)));
 
+    /// <summary>Verifies that every message type is a record.</summary>
     [Fact]
     public void AllMessageTypes_ShouldBeRecords()
     {
@@ -29,6 +30,7 @@ public class MessageConventionTests
         }
     }
 
+    /// <summary>Verifies that every message timestamp property is a <c>DateTimeOffset</c>.</summary>
     [Fact]
     public void AllMessageTimestampProperties_ShouldBeDateTimeOffset()
     {
@@ -46,6 +48,7 @@ public class MessageConventionTests
         }
     }
 
+    /// <summary>Verifies that a deploy-instance command survives a JSON round trip.</summary>
     [Fact]
     public void JsonRoundTrip_DeployInstanceCommand_ShouldSucceed()
     {
@@ -60,6 +63,7 @@ public class MessageConventionTests
         Assert.Equal(msg.InstanceUniqueName, deserialized.InstanceUniqueName);
     }
 
+    /// <summary>Verifies that JSON containing an unknown field still deserializes.</summary>
     [Fact]
     public void JsonForwardCompatibility_UnknownField_ShouldDeserialize()
     {
@@ -72,6 +76,7 @@ public class MessageConventionTests
         Assert.Equal("dep-1", deserialized!.DeploymentId);
     }
 
+    /// <summary>Verifies that JSON missing an optional field still deserializes.</summary>
     [Fact]
     public void JsonBackwardCompatibility_MissingOptionalField_ShouldDeserialize()
     {
@@ -85,6 +90,7 @@ public class MessageConventionTests
         Assert.Null(deserialized.ErrorMessage);
     }
 
+    /// <summary>Verifies that a site health report survives a JSON round trip.</summary>
     [Fact]
     public void JsonRoundTrip_SiteHealthReport_ShouldSucceed()
     {
@@ -110,6 +116,7 @@ public class MessageConventionTests
         Assert.Equal(1, deserialized.SequenceNumber);
     }
 
+    /// <summary>Verifies that a deploy-artifacts command survives a JSON round trip.</summary>
     [Fact]
     public void JsonRoundTrip_DeployArtifactsCommand_ShouldSucceed()
     {