first commit

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/rag_cut/parsers/pdf/standardize.py

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+"""Document standardization for PDF input."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import fitz
+
+
+def open_document(path: Path) -> fitz.Document:
+    """Open and normalize a PDF for downstream layout processing."""
+    doc = fitz.open(path)
+    if doc.is_encrypted and not doc.authenticate(""):
+        doc.close()
+        raise ValueError(f"Encrypted PDF cannot be opened: {path.name}")
+    return doc