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.DeploymentManager.Tests/FlatteningPipelinePreviewTests.cs

@@ -24,6 +24,7 @@ public class FlatteningPipelinePreviewTests
     private readonly ISharedSchemaRepository _sharedSchemaRepo = Substitute.For<ISharedSchemaRepository>();
     private readonly FlatteningPipeline _sut;
 
+    /// <summary>Initializes the test class with in-memory repositories and the pipeline under test.</summary>
     public FlatteningPipelinePreviewTests()
     {
         _sharedSchemaRepo.ListAsync(Arg.Any<CancellationToken>()).Returns([]);
@@ -60,6 +61,8 @@ public class FlatteningPipelinePreviewTests
             .Returns([new DataConnection("MxGateway", "MxGateway", SiteId) { Id = 1 }]);
     }
 
+    /// <summary>Verifies that previewing matches flattening a freshly created instance.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Preview_matches_flatten_of_fresh_instance()
     {
@@ -81,6 +84,8 @@ public class FlatteningPipelinePreviewTests
         Assert.Contains(actual, a => a.Item1 == "Left.MoveInFlag");
     }
 
+    /// <summary>Verifies that previewing an unknown template fails.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Preview_unknown_template_fails()
     {
@@ -88,6 +93,8 @@ public class FlatteningPipelinePreviewTests
         Assert.True(r.IsFailure);
     }
 
+    /// <summary>Verifies that previewing never touches the instance repository.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Preview_never_touches_instance_repository()
     {