fix(cluster-infrastructure): resolve ClusterInfrastructure-005,007,008 — confirm config-section constant, XML docs, phase-status cleanup

tests/ScadaLink.ClusterInfrastructure.Tests/ClusterOptionsTests.cs

@@ -35,6 +35,14 @@ public class ClusterOptionsTests
         Assert.Empty(options.SeedNodes);
     }
 
+    [Fact]
+    public void SectionName_IsTheExpectedAppSettingsSection()
+    {
+        // CI-005: ClusterOptions must expose a single-source-of-truth constant for
+        // its appsettings.json section so binding sites do not hard-code the string.
+        Assert.Equal("ScadaLink:Cluster", ClusterOptions.SectionName);
+    }
+
     [Fact]
     public void Properties_CanBeSetToCustomValues()
     {