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.CLI.Tests/Commands/ExternalSystemRetryOptionTests.cs

@@ -26,6 +26,8 @@ public class ExternalSystemRetryOptionTests
     private static Option? FindOption(Command command, string name)
         => command.Options.SingleOrDefault(o => o.Name == name);
 
+    /// <summary>Verifies that the create and update subcommands expose the optional retry-policy options.</summary>
+    /// <param name="subcommand">The name of the subcommand under test.</param>
     [Theory]
     [InlineData("create")]
     [InlineData("update")]
@@ -42,6 +44,7 @@ public class ExternalSystemRetryOptionTests
         Assert.False(retryDelay!.Required);
     }
 
+    /// <summary>Verifies that the create subcommand parses the supplied retry-policy values.</summary>
     [Fact]
     public void Create_ParsesRetryPolicyValues()
     {
@@ -56,6 +59,7 @@ public class ExternalSystemRetryOptionTests
         Assert.Equal(60, parse.GetValue<int?>("--retry-delay-seconds"));
     }
 
+    /// <summary>Verifies that the update subcommand parses the supplied retry-policy values.</summary>
     [Fact]
     public void Update_ParsesRetryPolicyValues()
     {
@@ -70,6 +74,7 @@ public class ExternalSystemRetryOptionTests
         Assert.Equal(10, parse.GetValue<int?>("--retry-delay-seconds"));
     }
 
+    /// <summary>Verifies that the retry-delay option alias is accepted by the parser.</summary>
     [Fact]
     public void RetryDelayAliasIsAccepted()
     {