Documentation updates:
- Update README.md title and all references
- Update PROJECT_GUIDELINES.md title and guidelines
- Update all documentation files in docs/ directory
- Update device setup guides (Kobo, KOReader)
- Update API and architecture documentation
- Update completion summaries and progress reports
This is part 5 of the project rename to Bookhoard.
- Add SECURITY_AUDIT.md with A- security rating
- Add SECURITY_ENHANCEMENTS.md for improvements
- Add DEVICE_CAP_IMPLEMENTATION.md complete guide
- Add KOREADER_SETUP.md device setup guide
- Add SYNC_USER_GUIDE.md user documentation
- Document all API endpoints and features
- Include security considerations and best practices
john-okeefe