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/CaptiveDependencyGuard.cs

@@ -78,7 +78,7 @@ internal static class CaptiveDependencyGuard
     /// It previously held two entries — <c>AuditLogIngestActor._injectedRepository</c> and
     /// <c>SiteCallAuditActor._injectedRepository</c> — nullable repository fields assigned only
     /// by explicitly test-mode constructors. They were safe solely because no production call
-    /// site picked those overloads, which left the row-45 captive-dependency bug one
+    /// site picked those overloads, which left the captive-dependency bug one
     /// constructor call away. Register row 61 deleted the constructors instead: both actors now
     /// have a single <see cref="IServiceProvider"/> constructor, the fields are gone, and the
     /// test fixtures build stub providers that hand a repository out of a scope. With the shape