## What changed
Launch managed app-server and updater processes directly through the shared background command helper, removing the macOS `taskpolicy -b` wrapper and its availability probe. Remove the associated launch-policy tests and macOS daemon-startup test serialization.
Retain the 30-second macOS readiness timeout because older updaters can pass background policy to replacement daemons during upgrades.
GitOrigin-RevId: d8620a49139bd2a5c226c624cf7908e06ba7ba38