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Sorry to be blunt, but I feel like this is a big unanswered question that you should be addressing. Why would I use your tool over the other well-known alternatives? I read through your overview and I don't see an answer.
You say that this is intended "for environments where you don’t want to stand up a full supervisor stack (or don’t have one)". And you compare it to systemd. But what Linux developer doesn't already have systemd installed?
Or to use a different comparison, what advantage does "fws run" have over "podman run"? Podman already supports PTYs that can be attached/detached, allows isolating different processes, and has an HTTP API.
It seems like you intend this for situations where you want a multi-pane text-base UI that resembles an IDE. But personally, I prefer to do this sort of thing by composing existing tools that provide that functionality (namely tmux/screen and Docker/Podman) rather than using a single integrated tool that tries to replace both.
Secondly, what does this give me that either systemd or Supervisor (where systemd isn't available) don't already give me?
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