Refactor Agent System

[braden-seaborn]

• Refactor the agent system so that we can easily create many modular agents (define standardized layout for agents)
• Instead of having a single entrypoint, we should have workflows that can be ran. For example we can have a standard web interaction workflow where the user can talk to the agent and tell it todo things, or another for collecting data, or another for automating some task.
• Workflows and other behaviors should be only triggered through the Weave Service API.
• We should also be able to collect data from the api such as the service health, content of the current browser instance (and be able to interact with it), load user profiles, etc.