Fix audit findings for coverage, architecture checks, and XML docs

tests/CBDD.Tests/NullableStringIdTests.cs

@@ -11,16 +11,25 @@ namespace ZB.MOM.WW.CBDD.Tests
     {
         private const string DbPath = "nullable_string_id.db";
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NullableStringIdTests"/> class.
+        /// </summary>
         public NullableStringIdTests()
         {
             if (File.Exists(DbPath)) File.Delete(DbPath);
         }
 
+        /// <summary>
+        /// Disposes test resources.
+        /// </summary>
         public void Dispose()
         {
             if (File.Exists(DbPath)) File.Delete(DbPath);
         }
 
+        /// <summary>
+        /// Verifies the mock counter collection is initialized.
+        /// </summary>
         [Fact]
         public void MockCounter_Collection_IsInitialized()
         {
@@ -30,6 +39,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             db.MockCounters.ShouldNotBeNull();
         }
 
+        /// <summary>
+        /// Verifies insert and find-by-id operations work for string identifiers.
+        /// </summary>
         [Fact]
         public void MockCounter_Insert_And_FindById_Works()
         {
@@ -52,6 +64,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             stored.Value.ShouldBe(42);
         }
 
+        /// <summary>
+        /// Verifies update operations work for string identifiers.
+        /// </summary>
         [Fact]
         public void MockCounter_Update_Works()
         {
@@ -77,6 +92,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             updated.Value.ShouldBe(20);
         }
 
+        /// <summary>
+        /// Verifies delete operations work for string identifiers.
+        /// </summary>
         [Fact]
         public void MockCounter_Delete_Works()
         {
@@ -99,6 +117,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             deleted.ShouldBeNull();
         }
 
+        /// <summary>
+        /// Verifies query operations work for string identifiers.
+        /// </summary>
         [Fact]
         public void MockCounter_Query_Works()
         {
@@ -121,6 +142,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             highValues[0].Name.ShouldBe("Second");
         }
 
+        /// <summary>
+        /// Verifies inherited string identifiers are stored and retrieved correctly.
+        /// </summary>
         [Fact]
         public void MockCounter_InheritedId_IsStoredCorrectly()
         {