The file is not used by the playbook's standard CLI install flow
(`make roles` / `just roles` only install roles via ansible-galaxy, not
collections). It exists for AWX / Ansible Automation Platform users,
where it is auto-detected during project sync.

Without this comment, the file looks like an unused leftover and is a
recurring source of confusion when discussing collection version pins
(should we add one here, etc.). Documenting the actual audience makes
those decisions more obvious.

No functional change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>