.arcconfig

peer: pass the `path` object to `make_peer`

We don't do anything with it yet, but we can start implementing it for each peer
type starting now.

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