Update ATVM status reporting and credential handling docs
- 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
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