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Run a tai execution-backend runtime (worker / beat / dashboard).  A backend runtime always registers a task backend, so it requires the worker bus — set TAI_BUS_REDIS_URL. The backend-runtime and server processes must converge on config reloads, so a busless backend is refused at boot (and again on any reload that would leave a backend without the bus). TAI_CONFIG_MODE=k8s is likewise refused without the bus.