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Extract text, tables, and metadata from scientific PDF papers and reports

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## Overview

PDF processing toolkit for extracting text, tables, and metadata from scientific papers, supplementary data files, and technical reports. Uses pdfplumber for high-fidelity text and table extraction with layout preservation, falling back to pypdf when pdfplumber is unavailable.

Supports page range selection for large documents and targeted extraction modes (text-only, tables-only, metadata-only) for efficient processing.

## Usage

```bash
# Extract everything from a PDF
python3 skills/pdf/scripts/pdf_extract.py --file /path/to/paper.pdf

# Extract only text from pages 1-5
python3 skills/pdf/scripts/pdf_extract.py --file /path/to/paper.pdf --pages "1-5" --extract text