dev.knotless.awaitDelegation

Asks this appview's gateway whether the delegation is approved (dev.knotless.getDelegation), which waits a while for it before saying it is not yet: ask again until done. Once done, the appview remembers the gateway for the account, so that sharing a repository for writing from the pages names it. A procedure, since it writes that. Requires the session cookie the pages' login sets.