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.Communication.Tests/GrpcSiteTransportFailFastTests.cs

@@ -9,7 +9,7 @@ using ZB.MOM.WW.ScadaBridge.Communication.Grpc;
 namespace ZB.MOM.WW.ScadaBridge.Communication.Tests;
 
 /// <summary>
-/// WP1.6: a send to a site with no configured gRPC channel must fail the caller's Ask immediately
+/// A send to a site with no configured gRPC channel must fail the caller's Ask immediately
 /// (<see cref="Status.Failure"/> wrapping <see cref="SiteChannelUnavailableException"/>) instead of
 /// warning-and-dropping the message and leaving the Ask to expire at its full timeout.
 /// </summary>
@@ -31,6 +31,7 @@ public class GrpcSiteTransportFailFastTests : TestKit
         Opts,
         NullLogger<GrpcSiteTransport>.Instance);
 
+    /// <summary>Verifies that a send to an unconfigured site faults the Ask quickly instead of timing out.</summary>
     [Fact]
     public void Send_ToUnconfiguredSite_FaultsTheAskFastInsteadOfTimingOut()
     {
@@ -57,6 +58,8 @@ public class GrpcSiteTransportFailFastTests : TestKit
         Assert.Contains("unconfigured-site", cause.Message);
     }
 
+    /// <summary>Verifies that an Ask against an unconfigured site completes faulted and fast via a Tell of a status failure.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Ask_AgainstUnconfiguredSite_CompletesFaultedFastViaTellStatusFailure()
     {
@@ -81,6 +84,8 @@ public class GrpcSiteTransportFailFastTests : TestKit
     /// <summary>Relays an Ask into the transport, exactly as <c>CentralCommunicationActor</c> does.</summary>
     private sealed class EchoingAskTarget : ReceiveActor
     {
+        /// <summary>Initializes the actor to relay every site envelope into the given transport.</summary>
+        /// <param name="transport">The transport that receives each relayed envelope.</param>
         public EchoingAskTarget(GrpcSiteTransport transport)
         {
             Receive<SiteEnvelope>(env => transport.Send(env, Sender));
@@ -89,7 +94,9 @@ public class GrpcSiteTransportFailFastTests : TestKit
 
     private sealed class NoKeyProvider : ISitePskProvider
     {
+        /// <inheritdoc />
         public ValueTask<string> GetAsync(string siteId, CancellationToken ct) => new("k");
+        /// <inheritdoc />
         public void Invalidate(string siteId) { }
     }
 }