docs: add comprehensive code review with findings and recommendations

Complete code review of Feature 002 demo website implementation:
- Critical issues resolved (library loading, CSP)
- High priority recommendations documented (ARIA, CDN references)
- Medium priority enhancements suggested
- Testing recommendations provided
- Performance metrics documented

Overall assessment: Good (7.5/10) - Production ready with fixes applied

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bejarcode