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.Host.Tests/NodeIdentityProviderTests.cs

@@ -16,6 +16,7 @@ public class NodeIdentityProviderTests
         return new NodeIdentityProvider(options);
     }
 
+    /// <summary>Verifies that the provider returns the configured node name.</summary>
     [Fact]
     public void NodeIdentityProvider_returns_configured_NodeName()
     {
@@ -24,6 +25,7 @@ public class NodeIdentityProviderTests
         Assert.Equal("central-a", provider.NodeName);
     }
 
+    /// <summary>Verifies that the provider returns null when the node name is not set.</summary>
     [Fact]
     public void NodeIdentityProvider_returns_null_when_NodeName_unset()
     {
@@ -32,6 +34,7 @@ public class NodeIdentityProviderTests
         Assert.Null(provider.NodeName);
     }
 
+    /// <summary>Verifies that the provider returns null when the node name is only whitespace.</summary>
     [Fact]
     public void NodeIdentityProvider_returns_null_when_NodeName_whitespace()
     {
@@ -40,6 +43,7 @@ public class NodeIdentityProviderTests
         Assert.Null(provider.NodeName);
     }
 
+    /// <summary>Verifies that the provider trims surrounding whitespace from the node name.</summary>
     [Fact]
     public void NodeIdentityProvider_trims_whitespace()
     {