Add readability-lxml and markdownify to dependencies

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

pyproject.toml

@@ -12,6 +12,8 @@ dependencies = [
     "openai>=1.12.0",
     "trafilatura>=1.12.2",
     "transformers",
+    "readability-lxml",
+    "markdownify",
 ]
 
 [build-system]