I'm building a web UI workspace right now where I have been planning to integrate the agent as an app or component instead of having it be the entire UI. I may fork PageAgent for that, lets see.
I'm intentionally building on a lightweight, in-page JavaScript foundation to carve out some differentiation from the Python-heavy agent ecosystem.
The "protocol" layer of AG-UI does look interesting. I'll look into it to see if I can reuse something, although it seems to be evolving more toward an integration framework rather than an open protocol.
Really glad this resonates with your use case. Lightweight embedding is exactly my priority scenario. Would love to hear how the work goes!