Give Chatbot context

[skeet70]

As a user of the demo I want to be able to chat with the chatbot and have it remember prior messages in our conversation.

On the server take context note ids as part of the chat request. Decrypt those notes and add them to the context notes, along with the one from the current query. On the client track all note ids that have been returned by the chat endpoint for this conversation and send them in again on the request.