Function build_sop_engine 

pub fn build_sop_engine(
    config: SopConfig,
    workspace_dir: &Path,
    audit_memory: Arc<dyn Memory>,
    adapters: SopEngineAdapters,
) -> (Arc<Mutex<SopEngine>>, Arc<SopAuditLogger>)

Build a single shared SopEngine + SopAuditLogger pair. This is the sole construction site for SOP state within a daemon. Callers receive Arc<Mutex<SopEngine>> and Arc<SopAuditLogger> handles — never call SopEngine::new or SopAuditLogger::new directly outside this module.