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/SiteCommandDtoMapperTraceTests.cs

@@ -17,6 +17,7 @@ public class SiteCommandDtoMapperTraceTests
 {
     private static readonly DateTimeOffset T = new(2026, 9, 5, 12, 0, 0, TimeSpan.Zero);
 
+    /// <summary>Verifies that a route-to-call response round-trips its child execution id and trace events.</summary>
     [Fact]
     public void RouteToCallResponse_RoundTrips_ChildExecutionId_AndTraceEvents()
     {
@@ -43,6 +44,7 @@ public class SiteCommandDtoMapperTraceTests
         Assert.Equal(run, restored.TraceEvents[0]);
     }
 
+    /// <summary>Verifies that old-shape DTOs map to untraced defaults.</summary>
     [Fact]
     public void OldShapeDtos_MapToUntracedDefaults()
     {
@@ -70,6 +72,7 @@ public class SiteCommandDtoMapperTraceTests
         Assert.Null(reply.TraceEvents);
     }
 
+    /// <summary>Verifies that the trace flag propagates on both request types.</summary>
     [Fact]
     public void TraceFlag_PropagatesOnBothRequests()
     {
@@ -82,6 +85,7 @@ public class SiteCommandDtoMapperTraceTests
         Assert.True(SiteCommandDtoMapper.FromProto(SiteCommandDtoMapper.ToProto(set)).Trace);
     }
 
+    /// <summary>Verifies that an empty trace events list maps to null rather than an empty list.</summary>
     [Fact]
     public void EmptyTraceEventsList_MapsToNull_NotEmpty()
     {