agent-shell 0.78 updates

Another month, another agent-shell update. If you missed the last post, have a look at the 0.73 update. As usual, this post showcases highlights, but please check out the full list of changes if you're after the nitty-gritty. What's agent-shell? agent-shell is a native Emacs mode to interact with AI agents powered by ACP (Agent Client Protocol). New supported agents Two agents join the family, available as usual via M-x agent-shell, or explicitly as follows: Antigravity (Google), #795 by @tychoish. Start it with M-x agent-shell-start-antigravity-agent. Qoder CLI, #831 by @unship. Start it with M-x agent-shell-start-qoder-agent. Prompt any time Likely the most impactful feature in the release. It's highly discoverable and plenty useful, so I'm expecting a fair amount of uptake. A typical shell experience offers a prompt. Users type and submit their commands and wait for the command to finish before the shell prompt is offered again. Deriving from comint-mode, agent-shell was no…