dev.knotless.setOrgMembership

Writes the account's dev.knotless.orgAcceptance record where the visibility says, in its public records or in the organization's space, takes back one in the other place, and asks the organization's gateway to take it in (dev.knotless.joinOrg). Requires the session cookie the pages' login sets: the appview acts with the session it keeps for that account. Clients holding their own session call the organization's gateway themselves.