chore: add AGENTS.md for opencode agents

# Agents

This is a meta-role (implementation role) that configures the system baseline by combining other roles.

## Role Analysis

- **Type**: Meta-role / Implementation role

- **OS Support**: Alpine 3.23, Debian 13

- **Dependencies**: 

  - `ans-common` - Core OS components

  - `ans-zabbix-agent` - Zabbix monitoring agent

## Child Roles

| Role | Description |

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

| ans-common | Core OS components and defaults |

| ans-zabbix_agent | Zabbix Agent 2 for monitoring |

## Testing

```bash

ansible-lint

molecule test

```