.arcconfig

repo: add a `wcachevfs` to access the `.hg/wcache/` directory

This wvfs will allow us to migrate various cache to the new `wcache` directory.
Helping with cache issues with "share".

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