chore: add AGENTS.md for opencode agents

AGENTS.md

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+# Agents
+
+This role contains simple ad-hoc tasks for system maintenance operations.
+
+## Role Analysis
+
+- **Type**: Utility/operations role
+- **OS Support**: Alpine 3.22, Debian 13
+- **Deployment Method**: Direct execution
+
+## Available Tags
+
+| Tag | Function |
+|-----|----------|
+| `chrony` | Force update time via Chrony |
+| `reboot` | Reboot the system |
+| `update` | Install system updates |
+
+## Tasks
+
+- **update** - System package updates
+- **reboot** - System reboot
+- **chrony** - Force time sync
+
+## Testing
+
+```bash
+ansible-lint
+molecule test
+```