chore: add AGENTS.md for opencode agents

# Agents

This role installs and configures Zabbix Proxy for centralized monitoring data collection.

## Role Analysis

- **Type**: Monitoring infrastructure role

- **OS Support**: Debian 12

- **Deployment Method**: Direct (package installation)

- **Scope**: Zabbix proxy installation and configuration

## Key Variables

| Variable | Default | Description |

|----------|---------|-------------|

| `zabbix_proxy_psk_id` | (required) | PSK identity |

| `zabbix_proxy_psk` | (required) | PSK secret |

| `zabbix_server_host` | `zabbix.siempie.internal` | Zabbix server address |

## Tags

| Tag | Purpose |

|-----|---------|

| `zabbix_proxy_install` | Manage proxy installation |

| `zabbix_proxy_config` | Manage proxy configuration |

## Testing

```bash

ansible-lint

molecule test

```