car-hunter #2 was approved and its commit status refused 403: mesh-tools only read the
repositories of a user. It is now a write collaborator on each repository the indexer's
modules state names (watched over the bus: at the start and on each registration), read
back and said as gitea.repo.writable; the operator's other repositories stay read-only.
gitea_grant_write and gitea_unwritable_repos do and show it by hand; gitea_commit_statuses
answers merge.writes.