simpler check and deps messages

rig/ctrl/addons.sh

@@ -1,9 +1,8 @@
 #!/usr/bin/env bash
 # Install the addons the active profile asked for, in the order listed.
-# Each addon is its own idempotent script in ctrl/addons/ — adding one is adding
-# a file, not editing a dispatcher.
-#
+# One idempotent script per addon in ctrl/addons/.
 # Usage: addons.sh install | list
+# Notes: docs/notes/addons.md
 set -euo pipefail
 cd "$(dirname "$0")"