- compose-config.test.mjs: assertDbService requires the pinned
postgres:18.6-bookworm image; new docker-gated real-stack probe starts the
stack and asserts SHOW server_version exposes 18.6; mutation probe proves
reverting to a floating major tag fails the criterion; parser probe updated
- build-targets.test.mjs: db-service mutation fixture updated to the pinned
image tag
implementer