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.Commons.Tests/Validators/MxGatewayEndpointConfigValidatorTests.cs

@@ -12,6 +12,7 @@ public class MxGatewayEndpointConfigValidatorTests
         ApiKey = "key",
     };
 
+    /// <summary>Verifies that a valid config passes validation.</summary>
     [Fact]
     public void Validate_ValidConfig_IsValid()
     {
@@ -20,6 +21,7 @@ public class MxGatewayEndpointConfigValidatorTests
         Assert.Empty(result.Errors);
     }
 
+    /// <summary>Verifies that a missing endpoint fails validation.</summary>
     [Fact]
     public void Validate_MissingEndpoint_Fails()
     {
@@ -33,6 +35,8 @@ public class MxGatewayEndpointConfigValidatorTests
             && e.Message.Contains("required", StringComparison.OrdinalIgnoreCase));
     }
 
+    /// <summary>Verifies that an endpoint with an unsupported scheme fails validation.</summary>
+    /// <param name="url">The endpoint URL with the bad scheme.</param>
     [Theory]
     [InlineData("opc.tcp://x:4840")]
     [InlineData("ftp://x")]
@@ -46,6 +50,7 @@ public class MxGatewayEndpointConfigValidatorTests
         Assert.Contains(r.Errors, e => e.EntityName == "Endpoint");
     }
 
+    /// <summary>Verifies that a missing API key fails validation.</summary>
     [Fact]
     public void Validate_MissingApiKey_Fails()
     {
@@ -56,6 +61,7 @@ public class MxGatewayEndpointConfigValidatorTests
         Assert.Contains(r.Errors, e => e.EntityName == "ApiKey");
     }
 
+    /// <summary>Verifies that a non-positive read timeout fails validation.</summary>
     [Fact]
     public void Validate_NonPositiveReadTimeout_Fails()
     {
@@ -66,6 +72,7 @@ public class MxGatewayEndpointConfigValidatorTests
         Assert.Contains(r.Errors, e => e.EntityName == "ReadTimeoutMs");
     }
 
+    /// <summary>Verifies that prefixed field names appear in the validation errors.</summary>
     [Fact]
     public void Validate_PrefixedFieldNames_AppearInErrors()
     {