Add Length property to AbsolutePath and RelativePath

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rafalmaciag

src/ModelingEvolution.FileSystem/AbsolutePath.cs

@@ -26,6 +26,11 @@ public AbsolutePath(string path)
         _value = NormalizePath(path);
     }
 
+    /// <summary>
+    /// Gets the length of the path string.
+    /// </summary>
+    public int Length => (_value ?? string.Empty).Length;
+
     /// <summary>
     /// Gets the file name portion of the path as a RelativePath.
     /// </summary>

src/ModelingEvolution.FileSystem/RelativePath.cs

@@ -34,6 +34,11 @@ public RelativePath(string path)
     /// </summary>
     public bool IsEmpty => string.IsNullOrEmpty(_value);
 
+    /// <summary>
+    /// Gets the length of the path string.
+    /// </summary>
+    public int Length => (_value ?? string.Empty).Length;
+
     /// <summary>
     /// Gets the file name portion of the path as a RelativePath.
     /// </summary>