- Add io_install_upgrade_test.go with IO-1 and IO-2 test scenarios
- IO-1: Fresh install / first boot
- Verifies mothership starts with empty volume
- Checks first-run setup page is served
- Validates PIN setup and persistence
- Confirms migrations run and health is green
- Ensures no nodes attached on fresh install
- IO-2: Idempotent restart & upgrade-in-place
- Verifies restart preserves PIN, nodes, and zones
- Checks no re-setup prompt after restart
- Validates data persists across restarts
- Confirms backup directory exists for upgrades
- Update integration_test.go TestMain to include IO tests
Closes: bf-dhlyk
d742023038