Agent Shell 0.5 Improvements

Since this project appears not to have been discussed on HN yet, I think we'll re-up https://news.ycombinator.com/item?id=45380695 instead. It's better for the first thread to be about the project as a whole, not just the latest update. One moment please...

Edit: https://news.ycombinator.com/item?id=45561672. I've added the other link to the toptext there also.

This is apparently an Emacs LLM mode.