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+FCM-M5-001 gate delta: Stack PR #789 head 0b106651f86b456c31a700c819ba48780b222c49 reached exact-head green Woodpecker pipeline 1860, but independent exact-head RoR rejected valid GNU env split-string payloads and option-permuted su root detection. Merge remains held. One PR/owner/lane is preserved; bounded repair is running in the same lane. Parent #758, M4-002, M5-002, canary/migration/deploy/systemd/tmux/live mutation remain held.