The server keeps ACL users in memory only, so a restart forgets every
consumer while the provisioner keeps running (hq issue 120). holds()
checks ACL GETUSER for the user, enabled, with the mesh's password, so
the harness makes a forgotten user again. Needs mesh-sdk 0.1.1.
redis provides redis-cache: a real admin client speaking RESP over a raw socket
(node:net, no deps); provisioner makes a keyspace-scoped ACL user per grant.
postgres provides postgres-database: admin client executing through psql (the
consistent shell-out port, like minio's mc), full DDL for create/drop database+
role, a CSV row parser, read-only query tool. Both emit
module.<x>.<thing>.provisioned/.deprovisioned from the provisioner. Both
typecheck; manifests parse.