Force full rebuild of talk's message state.
^- (quip move _..prep)
?~ old
ta-done:ta-init:ta
- :_ ..prep(+<+ u.old)
+ :_ ..prep(+<+ u.old(grams ~, known ~, count 0))
:~ [ost.bol %pull /server/client server ~]
[ost.bol %pull /server/inbox server ~]
peer-client
