Why: The user requires all merges to follow agent-run synchronization, review, current-head CI and platform admission.
Evidence: Existing delivery stages and owner-only protection boundary reviewed; exact current Gitea Chinese labels verified from runtime resources.
Impact: Strengthen the merge executor rule only; retain human stage reviews, owner protection actions and actual CI requirements.
Refs: User instruction; merge-queue implementation plan U4/U5; Dev PR #519; Issue #518