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

tests/CBDD.Tests/CompressionInsertReadTests.cs

@@ -8,6 +8,9 @@ namespace ZB.MOM.WW.CBDD.Tests;
 
 public class CompressionInsertReadTests
 {
+    /// <summary>
+    /// Tests insert with threshold should store mixed compressed and uncompressed slots.
+    /// </summary>
     [Fact]
     public void Insert_WithThreshold_ShouldStoreMixedCompressedAndUncompressedSlots()
     {
@@ -46,6 +49,9 @@ public class CompressionInsertReadTests
         }
     }
 
+    /// <summary>
+    /// Tests find by id should read mixed compressed and uncompressed documents.
+    /// </summary>
     [Fact]
     public void FindById_ShouldReadMixedCompressedAndUncompressedDocuments()
     {
@@ -91,6 +97,9 @@ public class CompressionInsertReadTests
         }
     }
 
+    /// <summary>
+    /// Tests insert when codec throws should fallback to uncompressed storage.
+    /// </summary>
     [Fact]
     public void Insert_WhenCodecThrows_ShouldFallbackToUncompressedStorage()
     {
@@ -186,11 +195,25 @@ public class CompressionInsertReadTests
 
     private sealed class FailingBrotliCodec : ICompressionCodec
     {
+        /// <summary>
+        /// Gets or sets the codec.
+        /// </summary>
         public CompressionCodec Codec => CompressionCodec.Brotli;
 
+        /// <summary>
+        /// Tests compress.
+        /// </summary>
+        /// <param name="input">Payload bytes to compress.</param>
+        /// <param name="level">Compression level.</param>
         public byte[] Compress(ReadOnlySpan<byte> input, CompressionLevel level)
             => throw new InvalidOperationException("Forced codec failure for test coverage.");
 
+        /// <summary>
+        /// Tests decompress.
+        /// </summary>
+        /// <param name="input">Compressed payload bytes.</param>
+        /// <param name="expectedLength">Expected decompressed payload length.</param>
+        /// <param name="maxDecompressedSizeBytes">Maximum allowed decompressed size.</param>
         public byte[] Decompress(ReadOnlySpan<byte> input, int expectedLength, int maxDecompressedSizeBytes)
             => throw new InvalidOperationException("This codec should not be used for reads in this scenario.");
     }