- Created SECURITY-HARDENING-PLAN.md with 6 security levels - Added setup-node1-security.sh for automated hardening - Added scan-image.sh for pre-deployment image scanning - Created docker-compose.secure.yml template - Includes: Trivy, fail2ban, UFW, auditd, rkhunter, chkrootkit - Network isolation, egress filtering, process monitoring - Incident response procedures and recovery playbook