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>

ansible/playbooks/compose-deploy.yml

@@ -0,0 +1,13 @@
+---
+# Deploy repo-owned Compose declarations (compose/<project>/compose.yml) to
+# inventory hosts. Non-secret source; server-local .env provides the values.
+# Gated: apply requires compose_deploy_confirm=true; --check is a read-only
+# diff + validation. See runbooks/ansible-operations.md.
+- name: Deploy repo-owned Compose declarations
+  hosts: docker_hosts
+  become: true
+  gather_facts: false
+  serial: 1
+  roles:
+    - role: compose_deploy
+      tags: [compose, deploy, mutating]