Also https://github.com/acon96/home-llm/blob/90c0edc0907e4567eeca89a6f89b43c0b0b807eb/docs/Setup.md

Home Assistant can absolutely do that. If you are ok with simple intent based phrasing it’ll do it out of the box. If you want complex understanding and reasoning you’ll have to run a local LLM, like Llama, on top of it

Yes XMPP supports voice. Had for well over a decade, maybe two.

Does Evolution not do that? Thunderbird might as well, not sure.