Whether the omnibar is ON for the current user (availability × opt-in).
Fail-closed: this is read from the shell template on every change-detection
pass, so an engine that isn't loaded yet (boot) or is permission-constrained
must resolve to the legacy trio, never throw.
Whether the omnibar is ON for the current user (availability × opt-in). Fail-closed: this is read from the shell template on every change-detection pass, so an engine that isn't loaded yet (boot) or is permission-constrained must resolve to the legacy trio, never throw.