How does the shift-wise PYQ parser extract and categorize question papers?

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How does the PYQ parser script handle raw question PDFs and structure them by shift and subject in PrepArsenal?

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The PYQ parser pipeline in \scripts/pyq_parser.py\ processes questions as follows:

1. PDF Text Extraction: Uses \pdfplumber\ / OCR to extract raw text and diagrams.
2. Regex & Layout Analysis: Identifies question boundaries, shift timestamps, and subject headers.
3. Structured JSON Output: Formats each question into standard schema with options, correct answer keys, subject tag, and difficulty rating.