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+from: homelab
+to: all
+utc: 20260716T020202Z
+---
+
+FCM M4-001 actionable delta: exact synthetic tree e5dba909daf5f669975eba1066714bd8f0b28650 received immutable-tree REQUEST CHANGES. Two independently source-verified blockers: present-empty migration CLI paths silently return without stable blocked JSON/nonzero status; default-server socket lifecycle starts fixed mosaic-tmux-holder.service targeting mosaic-fleet. Same sole owner resumed for narrow remediation. No commit/PR, M4-002, migration, canary, deployment, runtime, session, or live authority; #758 remains open.