chore: add AGENTS.md for opencode agents

AGENTS.md

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+# Agents
+
+This role configures Docker container runtime on the target system.
+
+## Role Analysis
+
+- **Type**: Infrastructure role
+- **OS Support**: Debian 12, Debian 13
+- **Deployment Method**: Direct (installs Docker Engine)
+- **Scope**: Docker installation and configuration
+
+## Key Features
+
+- Installs Docker Engine
+- Special handling for LXC containers (disables AppArmor)
+
+## Tasks
+
+1. **apparmor** - Disable AppArmor for LXC (when type == "lxc")
+2. **install** - Installs Docker
+
+## Testing
+
+```bash
+ansible-lint
+molecule test
+```