Function spawn_and_register_sop_driver 

pub fn spawn_and_register_sop_driver(
    handles: &SopDriverHandles,
    config: Config,
    engine: Arc<Mutex<SopEngine>>,
    audit: Option<Arc<SopAuditLogger>>,
    first_action: SopRunAction,
) -> bool

Start a headless run driver and register it with its generation in one atomic step.

The supported way for a generation-owned surface — cron, channel ingress, the dashboard, an approval resume — to start a driver: admit_sop_driver holds the registry lock across both halves, so a driver either belongs to an open generation or is never created. A caller with no generation to belong to (a one-shot command, whose process ends with it) uses spawn_headless_run_driver directly instead.