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

src/CBDD.Core/Indexing/CollectionSecondaryIndex.cs

@@ -56,6 +56,13 @@ public sealed class CollectionSecondaryIndex<TId, T> : IDisposable where T : cla
     {
     }
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CollectionSecondaryIndex{TId, T}"/> class from index storage abstractions.
+    /// </summary>
+    /// <param name="definition">The index definition.</param>
+    /// <param name="storage">The index storage abstraction.</param>
+    /// <param name="mapper">The document mapper.</param>
+    /// <param name="rootPageId">The existing root page identifier, if any.</param>
     internal CollectionSecondaryIndex(
         CollectionIndexDefinition<T> definition,
         IIndexStorage storage,