chore(examples): Add sample PDF files for testing (security manual, documentation)

[Yoo-SH]

Description

Create sample PDF files for testing document processing pipeline with realistic use cases.

Required Sample Files

• Security policy document (보안 정책 문서)
• Technical manual (기술 매뉴얼)
• User guide (사용자 가이드)
• Mixed Korean/English content documents

Requirements

• Files should represent realistic enterprise documents
• Include various PDF features (tables, images, multi-column layouts)
• Both Korean and English content
• Size: 5-20 pages per document
• Store in examples/ or test-data/ directory

Usage

These files will be used for:

• Testing PDF parsing improvements
• Demonstrating RAG capabilities
• Integration testing
• Documentation examples

Suggested Location

open-context/
├── examples/
│   ├── security-policy-sample.pdf
│   ├── technical-manual-sample.pdf
│   └── user-guide-sample.pdf