New callback events in Embed2

We've added three new events to the subscribeEvent action in Embed2. With these events, you can provide your clients with a better experience after a bot or AI Agent has handed the conversation off to a human agent:

Event keyTrigger
ada:agent:joinedAgent joined the conversation
ada:agent:leftAgent left the conversation
ada:conversation:messageCustomer received a message

If you're using the Embed2 script, these events are immediately available. If you're using the NPM package, update it to the latest version (1.7.17) to start using them.