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/ObservabilityTests.cs

@@ -8,7 +8,7 @@ using ZB.MOM.WW.ScadaBridge.HealthMonitoring;
 namespace ZB.MOM.WW.ScadaBridge.IntegrationTests;
 
 /// <summary>
-/// WP-8 (Phase 8): Observability validation.
+/// Observability validation.
 /// Verifies structured logs contain SiteId/NodeHostname/NodeRole,
 /// correlation IDs flow through request chains, and health dashboard shows all metric types.
 /// </summary>
@@ -16,11 +16,14 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
 {
     private readonly ScadaBridgeWebApplicationFactory _factory;
 
+    /// <summary>Initializes the test class with the shared web application factory.</summary>
+    /// <param name="factory">The shared web application factory.</param>
     public ObservabilityTests(ScadaBridgeWebApplicationFactory factory)
     {
         _factory = factory;
     }
 
+    /// <summary>Verifies that the Serilog output template includes the required node fields.</summary>
     [Fact]
     public void StructuredLog_SerilogTemplate_IncludesRequiredFields()
     {
@@ -33,6 +36,7 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
         Assert.Contains("{Level", template);
     }
 
+    /// <summary>Verifies that the Serilog enrichment is configured with the site id.</summary>
     [Fact]
     public void SerilogEnrichment_SiteId_Configured()
     {
@@ -48,6 +52,7 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
         }
     }
 
+    /// <summary>Verifies that every message contract carries a correlation id.</summary>
     [Fact]
     public void CorrelationId_MessageContracts_AllHaveCorrelationId()
     {
@@ -75,6 +80,7 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
         Assert.Equal("cmd-456", disableCmd.CommandId);
     }
 
+    /// <summary>Verifies that every metric type is represented in the site health report.</summary>
     [Fact]
     public void HealthDashboard_AllMetricTypes_RepresentedInReport()
     {
@@ -128,6 +134,7 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
         Assert.Equal(5, report.DeadLetterCount);
     }
 
+    /// <summary>Verifies that a registered site is marked online by the health aggregator.</summary>
     [Fact]
     public void HealthAggregator_SiteRegistration_MarkedOnline()
     {
@@ -162,6 +169,7 @@ public class ObservabilityTests : IClassFixture<ScadaBridgeWebApplicationFactory
         Assert.Equal(3, state.LatestReport!.ScriptErrorCount);
     }
 
+    /// <summary>Verifies that health report sequence numbers increase monotonically.</summary>
     [Fact]
     public void HealthReport_SequenceNumbers_Monotonic()
     {