chore: add AGENTS.md for opencode agents

# Agents

This role configures Keepalived for high availability (VRRP).

## Role Analysis

- **Type**: Infrastructure service role (HA)

- **OS Support**: Alpine 3.22, Debian 12

- **Deployment Method**: Direct (not Docker-based)

- **Scope**: Keepalived installation and VRRP configuration

## Tasks

1. **install** - Installs Keepalived

2. **config** - Configures VRRP instances

## Testing

```bash

ansible-lint

molecule test

```