IMPORTANT: This migration is BLOCKED until Impress 2020 is retired.
Created comprehensive deployment guide documenting:
- Why this migration is blocked (Impress 2020 uses openneo_id directly)
- Two paths forward: retire Impress 2020 (recommended) or coordinated update
- Complete step-by-step deployment checklist for when ready
- Rollback procedures
- Risk assessment and mitigations
- Success criteria and timeline estimates
This ensures we don't accidentally deploy this change before addressing
the Impress 2020 dependency.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
