TunnelTug k3s barge image hub

Built into the -mode barge -barge-runtime k3s controller. Public pull · authenticated push. Blobs on 0trust.social S3.

• Registry: https://hub.tunneltug.com
• Default image: hub.tunneltug.com/tunneltug/engine:latest
• Health: /_tunneltug/hub/health
• API: /v2/
• Storage: https://0trust.social/s3/tunneltug-hub

k3s pulls this registry automatically via the barge controller (k3s ctr).