docs: Initialize GitHub wiki with PDF documentation Wiki pages covering: - PDF Text Operators (Tj, TJ, ', ") - PDF Coordinate Systems - Font Types and Encodings - Content Stream Structure - Project Architecture - Redaction Engine - Testing Strategies - Lessons Learned (scrambled content, coordinate conversion) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>