chore: add AGENTS.md for opencode agents

AGENTS.md

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+# Agents
+
+This role configures Unbound as a local DNS resolver.
+
+## Role Analysis
+
+- **Type**: Infrastructure service role (DNS)
+- **OS Support**: Alpine 3.22, Debian 12
+- **Deployment Method**: Direct (not Docker-based)
+- **Scope**: DNS server installation and configuration
+
+## Tasks
+
+1. **install** - Installs Unbound DNS
+2. **config** - Configures DNS zones and forwarding
+
+## Testing
+
+```bash
+ansible-lint
+molecule test
+```