- change ATVM status formatting to the approved Markdown-table template with SUMMARY:, HOSTS:, TIMING:, and NOTES:
- document that normal status requests print locally only unless explicitly asked to send to Mattermost
- document Mattermost defaults and posting rules, including only sending after full run completion
- document the controller-side systemd watcher design for future automation
- add the secrets migration/cleanup review doc
- ignore .env.credentials.local in git and reflect the move toward using that local credentials file instead of hardcoded secrets
