- A checkout an earlier launch left for a project the instance may no longer
work in is covered by an empty tmpfs inside the sandbox; the host copy stays.
- The launcher rechecks every prepared project against the reloaded document
after preparation, and the bus's final admission takes the instance and
checks the broker's current unions.
- A project define whose vars changed since boot refuses its copy until the
next start.
- Instance-name collisions are recomputed at each reload from the frozen root
claims and the current project defines; every claimant refuses.