Result of a rollback (ADR-0008 WP2.B). A rollback RE-POINTS the deployment
pointer at an existing cut release — it does NOT append a new version, so
there is no new version stamp. unchanged is set when the pointer was
already at toVersion (idempotent no-op).
Result of a rollback (ADR-0008 WP2.B). A rollback RE-POINTS the deployment pointer at an existing cut release — it does NOT append a new version, so there is no new version stamp.
unchangedis set when the pointer was already attoVersion(idempotent no-op).