Add agent diagnostic script

scripts/diagnose_agent.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Diagnose Portainer Agent status on ubuntu-server-02
+
+ansible ubuntu-server-02 -i inventory/hosts.yml \
+  -m shell \
+  -a "docker logs portainer_agent 2>&1 | tail -30; echo '=== INSPECT ==='; docker inspect portainer_agent --format '{{.State.Status}} restarts={{.RestartCount}}' 2>&1; echo '=== DOCKER ROOT ==='; docker info 2>/dev/null | grep 'Docker Root Dir'" \
+  --become 2>&1