chore: add AGENTS.md for opencode agents

AGENTS.md

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+# Agents
+
+This role installs and configures Zabbix Web (frontend) with Apache.
+
+## Role Analysis
+
+- **Type**: Monitoring infrastructure role (web UI)
+- **OS Support**: Debian 12
+- **Deployment Method**: Direct (package installation)
+- **Scope**: Zabbix web frontend installation and configuration
+
+## Key Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `zabbix_web_name` | `Siempie Monitoring` | Web UI title |
+| `zabbix_server_db_name` | `zabbix` | Database name |
+| `zabbix_server_db_user` | `zabbix` | Database user |
+| `zabbix_server_db_pass` | `zabbixpass` | Database password |
+
+## Testing
+
+```bash
+ansible-lint
+molecule test
+```