Worker-bus boot rules (set TAI_BUS_REDIS_URL to enable the bus):
- more than one worker is refused without the bus — sibling workers would serve stale config after a reload with no channel to converge on;
- TAI_CONFIG_MODE=k8s is refused without the bus — a pod cannot see its own replica count;
- a manifest that registers a task backend is refused without the bus — the backend-runtime and server processes must converge on reloads. The workers rule lives in this CLI only: an external process manager driving the ASGI factory with its own —workers bypasses it, so set TAI_BUS_REDIS_URL in any multi-process deployment.