Deep Agents v0.5

New versions of `deepagents` and `deepagentsjs` introduce async subagents, allowing a primary agent to delegate long-running tasks without blocking its own processes. This feature enables parallel workstreams and stateful interactions by having the main agent launch a task on a remote agent and check for results later. The architecture supports heterogeneous deployments with specialized agents and relies on LangChain's open-source Agent Protocol for communication. Additionally, the update expands multi-modal support to include PDFs, audio, and video, with the supported file types dependent on the underlying model's capabilities.