.arcconfig

path: pass `path` to `peer` in `hg debugdiscovery`

We directly use the `path` object to build the `peer` object.

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