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.PerformanceTests/Failover/FailoverTimingTests.cs

@@ -18,16 +18,18 @@ namespace ZB.MOM.WW.ScadaBridge.PerformanceTests.Failover;
 /// member REMOVAL (detection + stability window + gossip) with singleton
 /// continuity asserted on the oldest; the oldest-crash direction is covered
 /// behaviorally by SbrFailoverTests.AutoDown_HardCrashOfOldestNode_* and by
-/// the docker failover drill. Covers overall review P2-10 / report-08 NF2
-/// and report-01 round-2 N1's measurement ask.
+/// the docker failover drill. Covers the measurement requested by the overall review.
 /// </summary>
 public class FailoverTimingTests(ITestOutputHelper output)
 {
     private sealed class EchoActor : ReceiveActor
     {
+        /// <summary>Initializes a new instance of the <see cref="EchoActor"/> class.</summary>
         public EchoActor() => ReceiveAny(msg => Sender.Tell(msg));
     }
 
+    /// <summary>Verifies that a hard kill of the younger node is followed by removal within the design envelope.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Trait("Category", "Performance")]
     [Fact]
     public async Task HardKillOfYoungerNode_SbrRemovalWithinDesignEnvelope()