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.CentralUI.Tests/Design/ExternalSystemsConnectionStringHidingTests.cs

@@ -25,6 +25,7 @@ public class ExternalSystemsConnectionStringHidingTests : BunitContext
     private readonly IInboundApiRepository _inbound = Substitute.For<IInboundApiRepository>();
     private readonly IDialogService _dialog = Substitute.For<IDialogService>();
 
+    /// <summary>Initializes the test context and registers the services the External Systems page depends on.</summary>
     public ExternalSystemsConnectionStringHidingTests()
     {
         Services.AddSingleton(_repo);
@@ -43,6 +44,7 @@ public class ExternalSystemsConnectionStringHidingTests : BunitContext
         AuthorizationPolicies.AddScadaBridgeAuthorization(Services);
     }
 
+    /// <summary>Verifies that the database connections tab does not render the connection string.</summary>
     [Fact]
     public void DbConnectionsTab_DoesNotRenderConnectionString()
     {