# 04-07-b-aggregate-relation-boundary-model-rework-checklist

- [x] replace same-JVM demo-first framing with shell-first explanatory framing
- [x] verify generated shell surface with `help` and `meta.describe`
- [x] explain relation kind, boundary, and join as separate axes
- [x] relocate same-JVM relation-boundary aggregate proof to `cozy` scripted
- [x] close sample and reflect completion in the parent plan
