chore: add AGENTS.md for opencode agents

# Agents

This role configures [Omni](https://www.siderolabs.com/omni/) - Sidero Labs' management platform for Talos Linux and Kubernetes.

## Role Analysis

- **Type**: Application server role (infrastructure management)

- **OS Support**: Debian 12

- **Deployment Method**: Docker

- **Dependencies**: Docker must be installed

## Tasks

1. **install omni** - Deploys Omni via Docker

2. **cleanup docker** - Cleans up Docker resources

## Testing

```bash

ansible-lint

molecule test

```