Workflow-Engine API used by Process-Designer-generated Use-Case orchestrators — seven routing statuses (`ON_SUCCESS` / `ON_FAIL` / `ON_TIMEOUT` / `ON_SKIP` / `ON_CANCEL` / `ON_EVENT` / `ON_EXIT`), `WorkflowConfig`/`addNode` graph construction, the Event node ◇ variant, `handlerFactory` Closure conventions, three opaque `WorkflowContext` slots (`reference`, `response`, `exception`), R5 routing-safety rules.
