.arcconfig

test: add more obsmarker tests for pruning scenarios

The obsfate output in cases of pruning is not ideal right now, add some tests
so have these scenarios around.

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