Create server images that are never modified after deployment and are replaced entirely for updates. Use this skill whenever the user mentions immutable infrastructure, golden image, packer, ami, cattle not pets, image bake, rebuild not patch, or is working with Packer, AMI, Docker, even if they never say "immutable infrastructure design" explicitly. Operates entirely on context the agent already has. Do not use it for unrelated application feature work or general coding questions.
