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.AuditLog.Tests/TestSupport/StubAuditRepositoryProvider.cs

@@ -30,6 +30,7 @@ internal static class StubAuditRepositoryProvider
     /// Builds a provider whose every scope yields the same audit-log repository instance.
     /// </summary>
     /// <param name="repository">Repository instance shared by every scope.</param>
+    /// <returns>A service provider whose scopes all resolve the supplied repository.</returns>
     public static ServiceProvider Build(IAuditLogRepository repository)
     {
         ArgumentNullException.ThrowIfNull(repository);