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.ExternalSystemGateway.Tests/ServiceWiringTests.cs

@@ -7,11 +7,12 @@ using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
 namespace ZB.MOM.WW.ScadaBridge.ExternalSystemGateway.Tests;
 
 /// <summary>
-/// ExternalSystemGateway-013: configuration options must actually influence the
+/// Configuration options must actually influence the
 /// registered HTTP client — an operator setting them must not be silently ignored.
 /// </summary>
 public class ServiceWiringTests
 {
+    /// <summary>Verifies that the per-system connection cap is applied to the primary handler of the named HTTP client.</summary>
     [Fact]
     public void MaxConcurrentConnectionsPerSystem_IsAppliedToTheNamedHttpClientPrimaryHandler()
     {
@@ -40,10 +41,11 @@ public class ServiceWiringTests
         Assert.Equal(4, sockets.MaxConnectionsPerServer);
     }
 
+    /// <summary>Verifies that the per-system connection cap is not applied to HTTP clients that do not belong to the gateway.</summary>
     [Fact]
     public void MaxConcurrentConnectionsPerSystem_IsNotAppliedToNonGatewayHttpClients()
     {
-        // ExternalSystemGateway-016: the gateway's connection cap must be scoped to
+        // The gateway's connection cap must be scoped to
         // its own per-system clients ("ExternalSystem_{name}"). It must NOT leak onto
         // unrelated HttpClient consumers in the same host process (e.g. the
         // Notification Service's OAuth2 token client) — that would silently throttle