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/TargetScale/TargetScaleHarnessSmokeTests.cs

@@ -3,7 +3,7 @@ using ZB.MOM.WW.ScadaBridge.LoadHarness;
 namespace ZB.MOM.WW.ScadaBridge.PerformanceTests.TargetScale;
 
 /// <summary>
-/// Keeps the target-scale load harness (deferred-work register #25 / Phase-8 WP-4)
+/// Keeps the target-scale load harness (a deferred-work register item)
 /// honest at CI scale.
 ///
 /// <para>
@@ -13,7 +13,7 @@ namespace ZB.MOM.WW.ScadaBridge.PerformanceTests.TargetScale;
 /// <c>dotnet test ZB.MOM.WW.ScadaBridge.slnx</c> (the <c>Category=Performance</c>
 /// trait enables a filter, it does not exclude by default), and a 20-minute test
 /// would be intolerable there. What this test protects is that the harness still
-/// compiles, wires up, and produces coherent measurements — so #25's evidence can be
+/// compiles, wires up, and produces coherent measurements — so the harness's evidence can be
 /// regenerated on demand rather than bit-rotting.
 /// </para>
 /// <para>