Optional Phoenix.PubSub integration for cross-node events and LiveView support.

This module provides publish/subscribe functionality for room events when Phoenix.PubSub is available. All functions gracefully handle cases where PubSub is not configured.

Usage

defmodule MyApp.Messaging do
  use Jido.Messaging, persistence: Jido.Messaging.Persistence.ETS,
    pubsub: MyApp.PubSub
end

# Subscribe to room events
MyApp.Messaging.subscribe("room_123")

# Events received:
# {:message_added, %Message{}}
# {:participant_joined, %Participant{}}
# {:participant_left, participant_id}