Promotes the fleet to FlowerCore.Updater main @ 2bdf108 which combines:
- PR #6 publish pre-signed releases (1a188f4)
- PR #7 deeper public-host privacy enforcement (8cd8544)
- PublishPreSignedAsync(stream, sig) Integration coverage (2bdf108)
Live image already imported to rke2-server and rolled via deploy-web.ps1.
This commit aligns the bluejay-infra source of truth so ArgoCD doesn't
snap the spec back to the previous tag (per
feedback_argocd_managed_image_overrides_do_not_stick).
6c21d14a98