8.10 Versioning and release notes (lightweight)
Even for labs, practise a boring release habit:
## badge-api 0.3.1 (sha-a3f2c1)
- Add GET /health
- Rollback: redeploy sha-99bb01
- Migrations: none
Keep it in GitHub Releases or a CHANGELOG.md — whatever your team agrees. The point is humans can answer "what is live?" without SSH archaeology.