graph-store: scry only once during +validate-graph
|= [=graph:store mark=(unit mark:store)]
^- ?
?~ mark %.y
- ?~ graph %.y
=/ =dais:clay
.^ =dais:clay
%cb
/(scot %p our.bowl)/[q.byk.bowl]/(scot %da now.bowl)/[u.mark]
==
+ |- ^- ?
+ ?~ graph %.y
%+ roll (tap:orm graph)
|= [[=atom =node:store] out=?]
^- ?
