docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Core/ZB.MOM.WW.OtOpcUa.Configuration.Tests/AuthorizationTests.cs

@@ -14,8 +14,11 @@ public sealed class AuthorizationTests
 {
     private readonly SchemaComplianceFixture _fixture;
 
+    /// <summary>Initializes a new instance of AuthorizationTests with the schema compliance fixture.</summary>
+    /// <param name="fixture">The schema compliance test fixture.</param>
     public AuthorizationTests(SchemaComplianceFixture fixture) => _fixture = fixture;
 
+    /// <summary>Verifies that the Node role can execute GetCurrentGenerationForCluster but not PublishGeneration.</summary>
     [Fact]
     public void Node_role_can_execute_GetCurrentGenerationForCluster_but_not_PublishGeneration()
     {
@@ -48,6 +51,7 @@ public sealed class AuthorizationTests
         }
     }
 
+    /// <summary>Verifies that the Node role cannot SELECT from configuration tables directly.</summary>
     [Fact]
     public void Node_role_cannot_SELECT_from_tables_directly()
     {
@@ -73,6 +77,7 @@ public sealed class AuthorizationTests
         }
     }
 
+    /// <summary>Verifies that the Admin role can execute PublishGeneration.</summary>
     [Fact]
     public void Admin_role_can_execute_PublishGeneration()
     {