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.IntegrationTests/Grpc/GrpcStreamIntegrationTests.cs

@@ -30,6 +30,7 @@ public class GrpcStreamIntegrationTests : TestKit
     /// events flow through Channel to gRPC response stream.
     /// Validates attribute value changes arrive with correct protobuf mapping.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Pipeline_AttributeValueChanged_FlowsToResponseStream()
     {
@@ -105,6 +106,7 @@ public class GrpcStreamIntegrationTests : TestKit
     /// <summary>
     /// End-to-end pipeline test for alarm state changes.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Pipeline_AlarmStateChanged_FlowsToResponseStream()
     {
@@ -164,6 +166,7 @@ public class GrpcStreamIntegrationTests : TestKit
     /// <summary>
     /// Verifies that mixed event types (attribute + alarm) flow through the same stream.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Pipeline_MixedEvents_FlowInOrder()
     {
@@ -226,6 +229,7 @@ public class GrpcStreamIntegrationTests : TestKit
     /// Verifies that when a stream is cancelled, the subscriber is cleaned up
     /// and the active stream count returns to zero.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Pipeline_Cancellation_CleansUpRelayActorAndSubscription()
     {
@@ -265,6 +269,7 @@ public class GrpcStreamIntegrationTests : TestKit
     /// Verifies that a duplicate correlation ID cancels the first stream and
     /// the second stream continues to receive events.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Pipeline_DuplicateCorrelationId_ReplacesStream()
     {