Document the complete automated release process for future reference:
- Step-by-step release workflow trigger
- What each phase does (Docker build, release creation)
- How to review and publish draft releases
- Troubleshooting common issues
- Emergency rollback procedures
- Workflow architecture and design principles
This ensures future AI contexts and maintainers understand the full
release process without needing to reverse-engineer the workflow.
Related to #671 (automated release workflow)
