simpler check and deps messages

rig/ctrl/addons/postgres.sh

@@ -1,20 +1,6 @@
 #!/usr/bin/env bash
-# PostgreSQL — the cluster half of the postgres cabinet.
-#
-# A cabinet is a public service dropped into the environment as-is — the
-# upstream image, unmodified, reachable at a known address. This is the cluster
-# half of it; the compose half is a `service.yml` beside a `cabinet.json`. The
-# declaration is made once and both paths read it, so nothing is remembered
-# twice.
-#
-# Plain manifests rather than a helm chart, matching the other addons: a chart
-# repo is a network dependency, and the offline example profile exists precisely so
-# there is a path with none. The image is pinned in ctrl/versions.env and can be
-# preloaded into a local registry like every other image here.
-#
-# One replica on a PVC. This models a dependency for local work, not a
-# highly-available database, and pretending otherwise on a kind node would be a
-# more elaborate lie rather than a more useful one.
+# PostgreSQL — the cluster half of the postgres cabinet: plain manifests, one replica on a PVC.
+# Notes: docs/notes/addons.md
 set -euo pipefail
 cd "$(dirname "$0")/.."