cloudinit/user-data.yaml and tools/cmd/railiance-plan-host relocated
to railiance-infra per ADR-003. Tombstone stubs left in place.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Update all operational references to reflect the new repo name per
ADR-003 (OAS S2 Cluster Runtime). Historical text in docs preserved.
Gitea remote URL updated locally (Gitea repo rename is a manual step).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>