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

tests/CBDD.Tests/CompressionOverflowTests.cs

@@ -8,6 +8,9 @@ namespace ZB.MOM.WW.CBDD.Tests;
 
 public class CompressionOverflowTests
 {
+    /// <summary>
+    /// Tests insert compressed document spanning overflow pages should round trip.
+    /// </summary>
     [Fact]
     public void Insert_CompressedDocumentSpanningOverflowPages_ShouldRoundTrip()
     {
@@ -43,6 +46,9 @@ public class CompressionOverflowTests
         }
     }
 
+    /// <summary>
+    /// Tests update should transition across compression thresholds.
+    /// </summary>
     [Fact]
     public void Update_ShouldTransitionAcrossCompressionThresholds()
     {