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+FCM-M5-001 new immutable candidate: PR #789 head 587ac423c25f35850414e8c5fd82a81f17212e9f, tree 5a74a05c7cfa3365648630538e42db5789c002f4, parent 0b106651f86b456c31a700c819ba48780b222c49. Remote identity verified; exactly packages/mosaic/src/fleet/fleet-documentation.spec.ts changed. Repair addresses GNU env split-string and su option-permutation bypasses; author preflight is green but non-authoritative. Fresh exact-head RoR and CI are running. Merge, parent #758, M4-002/M5-002, canary/migration/deploy/systemd/tmux/live mutation remain held.