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

tests/CBDD.Tests/ObjectIdTests.cs

@@ -5,6 +5,9 @@ namespace ZB.MOM.WW.CBDD.Tests;
 
 public class ObjectIdTests
 {
+    /// <summary>
+    /// Verifies new object identifiers are 12 bytes long.
+    /// </summary>
     [Fact]
     public void NewObjectId_ShouldCreate12ByteId()
     {
@@ -16,6 +19,9 @@ public class ObjectIdTests
         bytes.Length.ShouldBe(12);
     }
 
+    /// <summary>
+    /// Verifies object identifiers round-trip from their binary form.
+    /// </summary>
     [Fact]
     public void ObjectId_ShouldRoundTrip()
     {
@@ -29,6 +35,9 @@ public class ObjectIdTests
         restored.ShouldBe(original);
     }
 
+    /// <summary>
+    /// Verifies object identifier equality behavior.
+    /// </summary>
     [Fact]
     public void ObjectId_Equals_ShouldWork()
     {
@@ -40,6 +49,9 @@ public class ObjectIdTests
         oid3.ShouldNotBe(oid1);
     }
 
+    /// <summary>
+    /// Verifies object identifier timestamps are recent UTC values.
+    /// </summary>
     [Fact]
     public void ObjectId_Timestamp_ShouldBeRecentUtc()
     {