Lets a model be described as a 2.9 sigma member of the West instead of
"somewhere west of Silicon Valley". Signed per-axis z says which way and how
far on a named axis; Mahalanobis says how odd the placement is overall, and
uses the cluster covariance because the zones are elongated and tilted.
Reads the committed coords in wvs_model_ci.md rather than the coord cache,
so it reruns offline without re-querying seventeen models.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
