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.Host.Tests/CaptiveDependencyGuardTests.cs

@@ -19,7 +19,7 @@ public class CaptiveDependencyGuardSelfTests
     private interface IPretendScopedService;
 
     /// <summary>
-    /// POSITIVE CONTROL — the pre-row-45 shape, preserved permanently. An actor that caches a
+    /// POSITIVE CONTROL — the original captive-dependency shape, preserved permanently. An actor that caches a
     /// scoped-typed service for its lifetime is exactly what <c>NotificationOutboxActor</c>
     /// looked like before 9e769735, and the guard must report it.
     /// </summary>
@@ -67,6 +67,7 @@ public class CaptiveDependencyGuardSelfTests
     private static readonly IReadOnlySet<Type> PretendScopedSet =
         new HashSet<Type> { typeof(IPretendScopedService) };
 
+    /// <summary>Verifies that the guard flags an actor that caches a scoped service.</summary>
     [Fact]
     public void Guard_Flags_ActorCachingAScopedService()
     {
@@ -78,6 +79,7 @@ public class CaptiveDependencyGuardSelfTests
         Assert.Equal(typeof(IPretendScopedService), violation.FieldType);
     }
 
+    /// <summary>Verifies that the guard flags an actor that caches a service scope even when the scoped set is empty.</summary>
     [Fact]
     public void Guard_Flags_ActorCachingAServiceScope_EvenWhenTheScopedSetIsEmpty()
     {
@@ -90,6 +92,7 @@ public class CaptiveDependencyGuardSelfTests
         Assert.Equal("_scope", violation.FieldName);
     }
 
+    /// <summary>Verifies that the guard flags an actor that caches a DbContext.</summary>
     [Fact]
     public void Guard_Flags_ActorCachingADbContext()
     {
@@ -100,6 +103,7 @@ public class CaptiveDependencyGuardSelfTests
         Assert.Equal(typeof(ScadaBridgeDbContext), violation.FieldType);
     }
 
+    /// <summary>Verifies that the guard flags the compiler-generated backing field of an auto-property of a scoped type.</summary>
     [Fact]
     public void Guard_Flags_ScopedAutoPropertyBackingField()
     {
@@ -110,6 +114,7 @@ public class CaptiveDependencyGuardSelfTests
         Assert.Contains("Captive", violation.FieldName, StringComparison.Ordinal);
     }
 
+    /// <summary>Verifies that the guard allows fields that hold the root provider or a scope factory.</summary>
     [Fact]
     public void Guard_Allows_RootProviderAndScopeFactoryFields()
     {
@@ -252,6 +257,7 @@ public class CentralCaptiveDependencyGuardTests : IDisposable
     private readonly CentralDbTestEnvironment _dbEnv;
     private readonly List<ServiceDescriptor> _descriptors = [];
 
+    /// <summary>Initializes a new instance of the <c>CentralCaptiveDependencyGuardTests</c> class.</summary>
     public CentralCaptiveDependencyGuardTests()
     {
         _previousEnv = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT");
@@ -309,6 +315,7 @@ public class CentralCaptiveDependencyGuardTests : IDisposable
         _ = _factory.Server;
     }
 
+    /// <summary>Disposes the web application factory.</summary>
     public void Dispose()
     {
         try
@@ -322,6 +329,7 @@ public class CentralCaptiveDependencyGuardTests : IDisposable
         }
     }
 
+    /// <summary>Verifies that no actor in the central composition root holds captive scoped state.</summary>
     [Fact]
     public void Central_NoActorHoldsCaptiveScopedState()
     {
@@ -352,6 +360,7 @@ public class SiteCaptiveDependencyGuardTests : IDisposable
     private readonly string _tempAuditDbPath;
     private readonly IServiceCollection _services;
 
+    /// <summary>Initializes a new instance of the <c>SiteCaptiveDependencyGuardTests</c> class.</summary>
     public SiteCaptiveDependencyGuardTests()
     {
         _tempDbPath = Path.Combine(Path.GetTempPath(), $"sb_guard_{Guid.NewGuid()}.db");
@@ -385,6 +394,7 @@ public class SiteCaptiveDependencyGuardTests : IDisposable
         _services = builder.Services;
     }
 
+    /// <summary>Deletes the temporary database files, ignoring failures.</summary>
     public void Dispose()
     {
         foreach (var path in new[] { _tempDbPath, _tempTrackingDbPath, _tempLocalDbPath, _tempAuditDbPath })
@@ -393,6 +403,7 @@ public class SiteCaptiveDependencyGuardTests : IDisposable
         }
     }
 
+    /// <summary>Verifies that no actor in the site composition root holds captive scoped state.</summary>
     [Fact]
     public void Site_NoActorHoldsCaptiveScopedState()
     {