.arcconfig

chistedit: change in-progress message

Saying "running histedit" is an artifact of when chistedit was a
separate thing from histedit. I found the message a bit confusing,
since wasn't I running histedit from the beginning, just from the
curses interface?

The whole thing is now histedit, both the curses interface and the
underlying procedure to apply a plan, so let's use a message that
doesn't make a distinction.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}