feat: add gated Compose deploy and make inventory the host source of truth

Keep sanitized Compose sources in-repo with a confirmation-gated Ansible
playbook, add repo-wide validation, tighten runbook ownership/STOP/review
metadata, and archive stale research docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

runbooks/mailcow-health.md

@@ -9,6 +9,12 @@ Read-only health check of the mailcow stack on mx2.
 - Applicable: [mx2.windy.me](../hosts/mx2.windy.me.md), `/opt/mail`.
 - Read-only: does not change mailcow configuration or service state.
 
+## Ownership
+
+- Owner: personal ops (Windy)
+- Last reviewed: 2026-08-17
+- Related systems: mx2.windy.me (`/opt/mail`)
+
 Target: [mx2.windy.me](../hosts/mx2.windy.me.md)  
 Path: `/opt/mail`  
 Prefer: the Ansible health report (`ansible/playbooks/health-report.yml --limit mailcow`),