The dev server serves plugin-designs/doxa-maps-spa/index.html as-is, with no
profile-config, so the shell read ?tab= there but never wrote it. The page is
ours: it now passes urlOwner 'app'. A partner's page still leaves it out.
DX Life publishes the gallery shell on a hidden page named Deep Research, so that is now the
default heading (profile-config.heading or the heading prop still override it), and the meta,
instance and demo page say the same.
profile-config experimental:false (or "hidden") hides the Experimental folder: the manifest is not
mined for experimental tabs, the folder has no rows, and a tab= request for one falls back to the
first visible tab. It is off only on request, so every other host keeps the folder as before.
