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/ExternalSystemFormAuditDrillinTests.cs

@@ -13,7 +13,7 @@ using ExternalSystemForm = ZB.MOM.WW.ScadaBridge.CentralUI.Components.Pages.Desi
 namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Design;
 
 /// <summary>
-/// Bundle D drill-in test (#23 M7-T12) for the External Systems edit page.
+/// Drill-in test for the External Systems edit page.
 /// The page-header chip routes operators into the central Audit Log
 /// pre-filtered by Target = external-system name. Create mode has nothing
 /// to drill into yet, so the link is suppressed.
@@ -22,6 +22,7 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
 {
     private readonly IExternalSystemRepository _repo = Substitute.For<IExternalSystemRepository>();
 
+    /// <summary>Initializes the test context with a substitute repository and test authentication.</summary>
     public ExternalSystemFormAuditDrillinTests()
     {
         Services.AddSingleton(_repo);
@@ -38,6 +39,7 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
         AuthorizationPolicies.AddScadaBridgeAuthorization(Services);
     }
 
+    /// <summary>Verifies that the edit page shows a recent audit activity link whose target equals the system name.</summary>
     [Fact]
     public void EditPage_HasRecentAuditActivityLink_WithTargetEqualToSystemName()
     {
@@ -57,6 +59,7 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
         });
     }
 
+    /// <summary>Verifies that the create page shows no recent audit activity link.</summary>
     [Fact]
     public void CreatePage_HasNoRecentAuditActivityLink()
     {
@@ -70,10 +73,11 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
         });
     }
 
+    /// <summary>Verifies that the form renders a timeout seconds input with the gateway default helper text.</summary>
     [Fact]
     public void Form_RendersTimeoutSecondsInput_WithGatewayDefaultHelperText()
     {
-        // PLAN-06 Task 12: the per-system TimeoutSeconds column (Task 8) needs a
+        // The per-system TimeoutSeconds column needs a
         // Central UI form field so Design users can actually set it.
         var cut = Render<ExternalSystemForm>();
 
@@ -84,6 +88,7 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
         });
     }
 
+    /// <summary>Verifies that saving a new system passes its timeout seconds to the repository.</summary>
     [Fact]
     public void SavingNewSystem_WithTimeoutSeconds_PassesTimeoutSecondsToRepository()
     {
@@ -105,6 +110,7 @@ public class ExternalSystemFormAuditDrillinTests : BunitContext
         });
     }
 
+    /// <summary>Verifies that saving an edited system updates the timeout seconds on the existing record.</summary>
     [Fact]
     public void SavingEditedSystem_UpdatesTimeoutSecondsOnExisting()
     {