Retire a consumer the mesh stops asking for, and delete only on a person's word (hq ADR 0230)

The hourly release of ADR 0229's brake still ended in the mesh acting alone on
a mistake. A consumer now stays active until the same unasked set holds for
five passes, waits for a person past three or half of those held, is disabled
and marked rather than withdrawn, comes back as it was when asked again, and is
deleted only through the provider's delete tool. The backend keeps the mark, so
a restart forgets nothing and finds what was withdrawn before.

modules/keycloak/module.json

@@ -39,6 +39,7 @@
     "user.deleted",
     "password.reset",
     "client.created",
+    "client.retired",
     "group.created",
     "role.created",
     "admin.repaired",