chore: add AGENTS.md for opencode agents

# Agents

This role configures Grafana and Prometheus monitoring stack.

## Role Analysis

- **Type**: Application server role (monitoring)

- **OS Support**: Debian 13

- **Deployment Method**: Docker

- **Dependencies**: Docker must be installed

## Components

1. **Prometheus** - Metrics collection

2. **Grafana** - Metrics visualization and dashboards

## Tasks

1. **install prometheus** - Deploys Prometheus via Docker

2. **install grafana** - Deploys Grafana via Docker

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

## Testing

```bash

ansible-lint

molecule test

```