Assist Steerability and Message Queue Update

There's been a lot of discussion lately about agent loops and how people interact with agents while they're working. We just shipped two features in Assist that make long-running tasks much easier to manage. The first is steerability as a first-class feature, so you can guide an agent toward the best possible outcome while it's executing instead of waiting until it's finished. The second is message queues, which let you line up a sequence of messages and tasks for the agent to work through automatically. It's a simple way to hand off a longer workload, let the agent keep moving, and come back later to review the results.