Add deployment debugging docs and enhance promotion workflow

- Add comprehensive debugging guide for Control Plane deployment failures
- Document Capacity AI memory starvation and SECRET_KEY_BASE issues
- Add environment variable verification before staging-to-production promotion
- Add automatic rollback capability when deployment health checks fail
- Include health check retry logic (12 attempts with 10s interval)
- Add job summary with deployment status

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: justin808