mesh-knowledge: bound every review failure per record, make one out of tries loud, and let only its author revise a pending insight (review of #211)

modules/mesh-knowledge/README.md

@@ -92,7 +92,11 @@ record it goes out from.
    - A judgement that cannot be had (the judge unreachable, or an answer that is not `approve`, or `changes` naming
      no finding) leaves the record proposed and says so on it (`get`'s `review`). It is never taken as an
      approval. It is asked again after 10, then 20 minutes; after 3 tries the record says its author proposes it
-     again to have it reviewed again.
+     again to have it reviewed again, and the module is unhealthy, naming it, so the mesh raises a condition.
+     An ask of the operator that cannot be made counts as a try the same way.
+   - A review whose outcome the database refused to keep is held back for that record alone (10, then 20
+     minutes, 3 tries, logged as given up), so it never blocks the records behind it.
+   - A progressive insight waiting for its review is revised only by its proven author.
    - A record revised while it is judged is not decided on the version judged; the newest is judged next.
    - On approve the record and its clauses are accepted and in force. Every clause it changes moves to
      `changed`, and every record it supersedes moves to `superseded`, each as a new version of that record. A record marked `needs-operator` is first asked of the