make it possible for turns to occur in the stream that are not agent-shell initiated

[smagnuso]

I am working on a muxer called hydra-acp that allows agent-shell to play nicely with the same session running in the terminal (or other clients like slack, browser, etc). The nice thing here is you can switch operating mode from emacs to terminal easily by:

npm install -g @hydra-acp/cli

And adding this to your .emacs:

(setq agent-shell-command-prefix (lambda (_buffer) (and (executable-find "hydra-acp") '("hydra-acp" "launch"))))
(advice-add 'agent-shell--make-acp-client :around
            (lambda (orig-fn &rest args)
              (let* ((buf (plist-get args :context-buffer))
                     (cmd (plist-get args :command))
                     (env (plist-get args :environment-variables))
                     (extra (delq nil
                                  (list (when buf (format "HYDRA_ACP_NAME=%s" (buffer-name buf)))
                                        (when cmd (format "HYDRA_ACP_AGENT=%s" cmd))))))
                (plist-put args :environment-variables (append extra env))
                (apply orig-fn args))))

With this you can then start agent-shell as normal and interact. Then in a terminal just run hydra-acp and the same session shows up in terminal making it easy to switch modes of operation. Similarly you can start in hydra-acp on the terminal and then go to agent-shell and find your session in the session list and join it there.

Thank you for contributing to agent-shell!

Checklist

• I agree to communicate (PR description and comments) with the author myself (not AI-generated).
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• I've read and followed the Contributing guidelines.
• I've filed a feature request/discussion for a new feature.
• I'm making visual changes, so I'm including screenshots so you can view and discuss.
• I've added tests where applicable.
• I've updated documentation where necessary.
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