Changes:
- XSS protection with escapeHtml() utility
- Responsive CSS (3 mobile breakpoints)
- Full accessibility: aria-labels, roles, focus-visible
- GraphView memory leak fix
- Immutable state management
Files:
- deck-v4.1.html: Production-ready monolith
- CHANGELOG.md: Version history and documentation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
