- migrate-test-db.sh: export DEV_PG_CONTAINER (inner script reads it, not CONTAINER)
- launch-single.sh: SYSTEM_DB_* must override root-.env CONTEXT_DB_* (set -a
re-source clobbers both external exports and :- fallbacks; two misdirected
launches audited, dev DB unchanged - report §5.8-3)
- task record done; full test report (nightly five chains PASS @5e409c1e,
migration S0-verified, deployment acceptance, rollback paths, follow-ups)