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/SerilogSinkConfigTests.cs

@@ -5,7 +5,7 @@ using Microsoft.Extensions.Configuration;
 namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
 
 /// <summary>
-/// Host-014 regression: REQ-HOST-8 requires the Host's Serilog sinks
+/// Regression test: the Host requires its Serilog sinks
 /// (console and file at minimum) to be <em>configuration-driven</em>. The sinks
 /// must be defined in a <c>Serilog</c> section in <c>appsettings.json</c> and
 /// applied via <c>ReadFrom.Configuration</c> — they must not be hard-coded in
@@ -28,6 +28,7 @@ public class SerilogSinkConfigTests
         throw new DirectoryNotFoundException("Could not locate src/ZB.MOM.WW.ScadaBridge.Host");
     }
 
+    /// <summary>Verifies that the shipped appsettings contain a Serilog section with console and file sinks.</summary>
     [Fact]
     public void ShippedAppSettings_HasSerilogSection_WithConsoleAndFileSinks()
     {
@@ -51,6 +52,7 @@ public class SerilogSinkConfigTests
         Assert.Contains("File", sinkNames);
     }
 
+    /// <summary>Verifies that the logger configuration factory applies the configured file sink.</summary>
     [Fact]
     public void LoggerConfigurationFactory_AppliesConfiguredFileSink()
     {