dev.knotless.shareRepo

Names the account among the collaborators of the repository's dev.knotless.repo record, as `knotless repo share --write` does: it pushes and commits through the gateway the owner delegated writes to, which must be named first, as `knotless account delegate` names it. Its owner can, logged in to this appview's web pages: the appview writes with the session it keeps for that account, which the pages' session cookie names. For an organization's repository, so can an admin who joined it, logged in to the pages or with a service token from their own PDS for this method: the appview's gateway, which the organization delegated its writes to, writes as the organization.