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.

src/ZB.MOM.WW.ScadaBridge.Communication/Actors/SiteAlarmAggregatorActor.cs

@@ -708,7 +708,7 @@ public sealed class SiteAlarmAggregatorActor : ReceiveActor, IWithTimers
     }
 
     /// <summary>
-    /// Arms the backoff retry for a failed fan-out: <c>reconnectDelay × 2^(failures-1)</c>,
+    /// Arms the backoff retry for a failed fan-out: <c>reconnectDelay × 2^(failures − 1)</c>,
     /// capped at <see cref="MaxSeedRetryBackoffMultiplier"/> × the reconcile interval. Once
     /// the cap is reached the periodic reconcile tick is doing the same work anyway, so no
     /// extra timer is armed.