Function spawn_worker_with_spool_authenticated 

pub fn spawn_worker_with_spool_authenticated(
    capacity: usize,
    bridge: Arc<dyn EventBus>,
    embedder: Arc<dyn Embedder>,
    vector_sink: Arc<dyn VectorSink>,
    spool_dir: Option<PathBuf>,
    journal_key: [u8; 32],
    metrics: Arc<Registry>,
) -> WorkerHandle

Start the worker pool with authenticated active-workflow journals.