Refactor user management in Ansible playbooks to standardize on keeper_user

- Updated user addition tasks across multiple playbooks (mcp_switchboard, mcpo, neo4j, neo4j_mcp, openwebui, postgresql, rabbitmq, searxng, smtp4dev) to replace references to ansible_user and remote_user with keeper_user.
- Modified PostgreSQL deployment to create directories and manage files under keeper_user's home.
- Enhanced documentation to clarify account taxonomy and usage of keeper_user in playbooks.
- Introduced new deployment for Agent S, including environment setup, desktop environment installation, XRDP configuration, and accessibility support.
- Added staging playbook for preparing release tarballs from local repositories.
- Created templates for XRDP configuration and environment activation scripts.
- Removed obsolete sunwait documentation.

ansible/inventory/host_vars/caliban.incus.yml

@@ -8,6 +8,11 @@ services:
   - docker
   - kernos
 
+# Account Taxonomy
+# principal_user is the AI agent operator account on this host
+principal_user: robert
+principal_uid: 1000
+
 # Alloy
 alloy_log_level: "warn"