chore: add AGENTS.md for opencode agents

# Agents

This role/playbook manages Proxmox VE cluster updates with Ceph maintenance mode handling.

## Role Analysis

- **Type**: Infrastructure automation (playbook + tasks)

- **OS Support**: Proxmox VE 9

- **Deployment Method**: Direct SSH to Proxmox nodes

- **Scope**: Cluster update automation with HA support

## Key Features

- Serial node updates (one at a time)

- Ceph maintenance mode integration

- Cluster configuration management

## Tags

| Tag | Purpose |

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

| `configure-cluster` | Configure Proxmox cluster nodes |

| `update-cluster` | Update Proxmox cluster (with Ceph handling) |

## Testing

```bash

ansible-lint

molecule test

```