chore: add AGENTS.md for opencode agents

# Agents

This role manages core OS components and defaults tailored for Siempie infrastructure. This is the foundational role for all Debian/Ubuntu systems.

## Role Analysis

- **Type**: Base system configuration role

- **OS Support**: Debian 12, Debian 13, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Alpine 3.23

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

- **Scope**: Comprehensive system configuration

## Key Variables

| Variable | Default | Description |

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

| `apt_automatic_reboot_time` | `03:45` | Automated reboot time |

| `apt_automatic_reboot` | `true` | Enable automated reboots |

| `apt_enable_universe` | `true` | Enable Ubuntu universe repo |

| `firewall_enable` | `true` | Enable firewall |

| `ntp_server` | `time.cloudflare.com` | NTP server |

| `timezone` | `Europe/Amsterdam` | System timezone |

| `swap` | `false` | Enable swap |

## Available Tags

- `apt` - APT package management

- `apt-update` - APT update

- `apt-cleanup` - APT cleanup

- `cron` - Cron jobs

- `environment-file` - Environment configuration

- `hostname` - Hostname management

- `firewall` - UFW firewall

- `journald` - Systemd journal config

- `locale` - Locale settings

- `ntp` - NTP/Chrony configuration

- `sshd` - SSH daemon config

- `swap` - Swap configuration

- `sysctl` - Kernel parameters

- `systemctl` - Systemd units

- `timezone` - Timezone settings

- `usermanagement` - User management

## Testing

```bash

ansible-lint

molecule test

```