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

tests/CBDD.Tests/AttributeTests.cs

@@ -13,6 +13,9 @@ namespace ZB.MOM.WW.CBDD.Tests
         private readonly System.Collections.Concurrent.ConcurrentDictionary<string, ushort> _keyMap = new(StringComparer.OrdinalIgnoreCase);
         private readonly System.Collections.Concurrent.ConcurrentDictionary<ushort, string> _keys = new();
 
+        /// <summary>
+        /// Initializes lookup maps used by attribute mapper tests.
+        /// </summary>
         public AttributeTests()
         {
             ushort id = 1;
@@ -25,6 +28,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             }
         }
 
+        /// <summary>
+        /// Verifies table attribute mapping resolves the expected collection name.
+        /// </summary>
         [Fact]
         public void Test_Table_Attribute_Mapping()
         {
@@ -33,6 +39,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             mapper.CollectionName.ShouldBe("test.custom_users");
         }
 
+        /// <summary>
+        /// Verifies required attribute validation is enforced.
+        /// </summary>
         [Fact]
         public void Test_Required_Validation()
         {
@@ -52,6 +61,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             thrown.ShouldBeTrue("Should throw ValidationException for empty Name.");
         }
 
+        /// <summary>
+        /// Verifies string length attribute validation is enforced.
+        /// </summary>
         [Fact]
         public void Test_StringLength_Validation()
         {
@@ -69,6 +81,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             thrown.ShouldBeTrue("Should throw ValidationException for Name too long.");
         }
 
+        /// <summary>
+        /// Verifies range attribute validation is enforced.
+        /// </summary>
         [Fact]
         public void Test_Range_Validation()
         {
@@ -81,6 +96,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             thrown.ShouldBeTrue("Should throw ValidationException for Age out of range.");
         }
 
+        /// <summary>
+        /// Verifies column attribute maps to the expected BSON field name.
+        /// </summary>
         [Fact]
         public void Test_Column_Name_Mapping()
         {
@@ -108,6 +126,9 @@ namespace ZB.MOM.WW.CBDD.Tests
             foundDisplayName.ShouldBeTrue("BSON field name should be 'display_name' from [Column] attribute.");
         }
 
+        /// <summary>
+        /// Verifies not-mapped attribute excludes properties from BSON serialization.
+        /// </summary>
         [Fact]
         public void Test_NotMapped_Attribute()
         {