Issue #1890 reports macOS agent updates stopping because the root group does not exist. Use numeric superuser ownership in the two shared lifecycle writes without relaxing failure handling or the least-privilege group boundary. Add a regression fixture that rejects named root ownership and checks that chown failures still prevent replacement.
Change-source: pulse-maintainer
(cherry picked from commit 19c2b6a925)
pulse-triage[bot]
657211f056