## Summary
- consolidate forgejo-runner how-to docs into current cards
- upgrade the k8s forgejo-runner deployment to the latest v12.8.x runner image
- switch the k8s runner from first-boot register flow to declarative server.connections config
- keep the runner image on the native Dagger build path and update the surrounding manifests/secrets
## Notes
- PR opened early for C1 review
- implementation and deployment verification will follow in subsequent commits
Reviewed-on: #338
Patch upgrade picks up idempotent FetchTask API, offline registration
fix, cloudflare/circl security dep update, and custom gRPC user-agent.
No config defaults changed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
