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.LoadHarness/Program.cs

@@ -1,9 +1,9 @@
 using System.Text.Json;
 using ZB.MOM.WW.ScadaBridge.LoadHarness;
 
-// Target-scale load harness (Phase-8 WP-4 / deferred-work register #25 + row 50).
+// Target-scale load harness.
 //
-// Full-scale protocol run (the WP-4 numbers):
+// Full-scale protocol run (the target-scale numbers):
 //   dotnet run -c Release --project tests/ZB.MOM.WW.ScadaBridge.LoadHarness -- \
 //     --sustain-minutes 20 --results loadharness-results.json
 //