No-op PubSub (default). Broadcasts are discarded; subscribe/2 is
unsupported. Use when you don't need to observe events (e.g. pure one-shot
ExAgent.run/3).
No-op PubSub (default). Broadcasts are discarded; subscribe/2 is
unsupported. Use when you don't need to observe events (e.g. pure one-shot
ExAgent.run/3).