soul-demo now runs as a k3s Deployment with HPA (1–8 replicas, 60% CPU
target) instead of a bare background process. k3s starts first in
entrypoint.sh, imports the soul-demo:local OCI tar from
/var/lib/rancher/k3s/agent/images, and auto-applies the Deployment,
NodePort Service, and HPA from the server/manifests dir. neuron-web
starts only after the soul-demo pod is Running. Cloud Run gen2 execution
environment required for k3s (provides /dev/kmsg and Linux capabilities).
