Hermes Agent previews async subagents

This is a practical agent-runtime upgrade: less flashy than a new model, but more important for real workflows where long-running research or coding tasks stall the whole session.

• –Background delegation returns a handle immediately instead of forcing the parent agent to wait
• –Results come back as a new conversation turn with the original task source attached, which helps avoid context confusion
• –v1 is single-task only, with batch async left as a follow-up
• –The cap defaults to three async children, suggesting Nous is prioritizing predictable runtime behavior over unbounded parallelism
• –The main risk is lifecycle complexity: interrupts, session changes, and completion routing now need to be boringly reliable