Add pypdf/python-docx deps, _extract_pdf_text/_extract_docx_text helpers, and summarize_pdf/summarize_docx wrappers that delegate to summarize_text. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>