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.ClusterInfrastructure.Tests/ClusterOptionsValidatorTests.cs

@@ -3,7 +3,7 @@ using Microsoft.Extensions.Options;
 namespace ZB.MOM.WW.ScadaBridge.ClusterInfrastructure.Tests;
 
 /// <summary>
-/// CI-004: Tests that <see cref="ClusterOptionsValidator"/> rejects the
+/// Tests that <see cref="ClusterOptionsValidator"/> rejects the
 /// catastrophic misconfigurations the design doc warns against — a
 /// <c>MinNrOfMembers</c> other than 1, an unsupported split-brain strategy,
 /// empty seed nodes, and timings where the heartbeat is not below the
@@ -22,6 +22,7 @@ public class ClusterOptionsValidatorTests
         DownIfAlone = true
     };
 
+    /// <summary>Verifies that the default options are valid.</summary>
     [Fact]
     public void DefaultOptions_AreValid()
     {
@@ -30,6 +31,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that a minimum member count other than one fails validation.</summary>
     [Fact]
     public void MinNrOfMembers_NotOne_FailsValidation()
     {
@@ -42,6 +44,8 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("MinNrOfMembers", result.FailureMessage);
     }
 
+    /// <summary>Verifies that an unsupported split-brain strategy fails validation.</summary>
+    /// <param name="strategy">The unsupported strategy name.</param>
     [Theory]
     [InlineData("keep-majority")]
     [InlineData("static-quorum")]
@@ -57,6 +61,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("SplitBrainResolverStrategy", result.FailureMessage);
     }
 
+    /// <summary>Verifies that an empty seed node list fails validation.</summary>
     [Fact]
     public void EmptySeedNodes_FailsValidation()
     {
@@ -69,6 +74,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("SeedNodes", result.FailureMessage);
     }
 
+    /// <summary>Verifies that a single seed node without acknowledgement fails validation.</summary>
     [Fact]
     public void SingleSeed_WithoutAcknowledgement_Fails()
     {
@@ -81,6 +87,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("AllowSingleNodeCluster", result.FailureMessage);
     }
 
+    /// <summary>Verifies that a single seed node passes when single-node clusters are explicitly allowed.</summary>
     [Fact]
     public void SingleSeed_WithAllowSingleNodeCluster_Passes()
     {
@@ -96,6 +103,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that an empty seed list fails even when single-node clusters are allowed.</summary>
     [Fact]
     public void EmptySeeds_FailsEvenWithFlag()
     {
@@ -110,10 +118,11 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("SeedNodes", result.FailureMessage);
     }
 
+    /// <summary>Verifies that a single seed node fails validation.</summary>
     [Fact]
     public void SingleSeedNode_FailsValidation()
     {
-        // CI-012: design doc says "both nodes are seed nodes" — a single-seed
+        // The design doc says "both nodes are seed nodes" — a single-seed
         // configuration defeats the no-startup-ordering-dependency guarantee and
         // must be rejected by the contract owner's validator, not just by the
         // Host's startup validator.
@@ -127,6 +136,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("2", result.FailureMessage);
     }
 
+    /// <summary>Verifies that a heartbeat interval that is not below the failure threshold fails validation.</summary>
     [Fact]
     public void HeartbeatNotBelowFailureThreshold_FailsValidation()
     {
@@ -140,6 +150,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("HeartbeatInterval", result.FailureMessage);
     }
 
+    /// <summary>Verifies that a non-positive stable-after duration fails validation.</summary>
     [Fact]
     public void NonPositiveStableAfter_FailsValidation()
     {
@@ -152,6 +163,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("StableAfter", result.FailureMessage);
     }
 
+    /// <summary>Verifies that disabling down-if-alone under the keep-oldest strategy fails validation.</summary>
     [Fact]
     public void DownIfAloneFalse_UnderKeepOldest_FailsValidation()
     {
@@ -165,6 +177,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("DownIfAlone", result.FailureMessage);
     }
 
+    /// <summary>Verifies that the auto-down strategy passes validation.</summary>
     [Fact]
     public void AutoDownStrategy_Passes()
     {
@@ -179,6 +192,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that disabling down-if-alone under the auto-down strategy passes validation.</summary>
     [Fact]
     public void DownIfAloneFalse_UnderAutoDown_Passes()
     {
@@ -193,6 +207,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that validation accumulates every failure rather than stopping at the first.</summary>
     [Fact]
     public void Validate_AccumulatesAllFailures()
     {
@@ -216,8 +231,9 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("HeartbeatInterval", result.FailureMessage);
     }
 
-    // ---- BootstrapGuard timing validation (Gitea #33) ----
+    // ---- BootstrapGuard timing validation ----
 
+    /// <summary>Verifies that a disabled bootstrap guard with zero timings passes validation.</summary>
     [Fact]
     public void BootstrapGuard_disabled_with_zero_timings_passes_validation()
     {
@@ -237,6 +253,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that an enabled bootstrap guard with default timings passes validation.</summary>
     [Fact]
     public void BootstrapGuard_enabled_with_default_timings_passes_validation()
     {
@@ -248,6 +265,7 @@ public class ClusterOptionsValidatorTests
         Assert.True(result.Succeeded, result.FailureMessage);
     }
 
+    /// <summary>Verifies that an enabled bootstrap guard with non-positive probe seconds fails validation.</summary>
     [Fact]
     public void BootstrapGuard_enabled_with_nonpositive_probe_seconds_fails_validation()
     {
@@ -262,6 +280,7 @@ public class ClusterOptionsValidatorTests
         Assert.Contains("PartnerProbeSeconds", result.FailureMessage);
     }
 
+    /// <summary>Verifies that an enabled bootstrap guard with a non-positive interval or timeout fails validation.</summary>
     [Fact]
     public void BootstrapGuard_enabled_with_nonpositive_interval_or_timeout_fails_validation()
     {