gitea asked an owed status again every 30 s forever, even on 403 and 404 (jschoubben/hal and jschoubben/novadock, 119
times each in the sweep), and a key the checker deleted did not end a loop already running.
Quick fix: return from askAgain on 403/404. Thorough fix: the same, said once with its cause; a delete of the key
marks its revision seen, so any running ask again ends before its next write; a newer revision still asks anew.
The checker no longer owes statuses outside the mesh (mesh-delivery), which removes the trigger. Not done: raising
the module's health, since gitea's TypeScript SDK has no seat publish for a condition (mesh-sdk).