Extract structured fields from an unstructured PDF using regex/heuristics.

Args: pdf_path: Path to the PDF file. schema: JSON Schema describing the fields to extract (must have a non-empty 'properties' object). A built-in schema name (e.g. "invoice") or a path to a .json schema file is also accepted.

Returns: {"ok": True, "data": {...}, "text_length": N} on success, or {"ok": False, "error": "..."} on failure (corrupt PDF, bad schema, ...).

Validate extracted data against a JSON Schema.

Args: data: The data to check (e.g. the "data" from extract_fields). schema: JSON Schema to validate against.

Returns: A structured report with passed/failed/missing field lists and a human-readable reason for each failure. Never raises: invalid schemas are reported via the "error" key instead.

List document types with pre-built schemas (e.g. invoice, resume, purchase_order).