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.SiteEventLogging.Tests/TestLocalDb.cs

@@ -38,6 +38,8 @@ public sealed class TestLocalDb : IDisposable
     public ILocalDb Db { get; }
 
     /// <summary>Opens a local database at <paramref name="databasePath"/>.</summary>
+    /// <param name="databasePath">The filesystem path of the SQLite database file.</param>
+    /// <returns>A wrapper owning the opened database and its service provider.</returns>
     public static TestLocalDb Create(string databasePath)
     {
         var configuration = new ConfigurationBuilder()
@@ -58,6 +60,7 @@ public sealed class TestLocalDb : IDisposable
     /// Deletes <paramref name="databasePath"/> and its WAL sidecars. Call only after the
     /// owning <see cref="TestLocalDb"/> is disposed — the master connection anchors the WAL.
     /// </summary>
+    /// <param name="databasePath">The filesystem path of the SQLite database file whose files are deleted.</param>
     public static void DeleteFiles(string databasePath)
     {
         foreach (var suffix in new[] { "", "-wal", "-shm" })
@@ -66,5 +69,6 @@ public sealed class TestLocalDb : IDisposable
         }
     }
 
+    /// <summary>Disposes the underlying service provider.</summary>
     public void Dispose() => _provider.Dispose();
 }