The builder's forms gain seat-reference for bundles and archives (oci-artifact-registry/<module>/<artifact>@<digest>); the old-form window writes the older artifact-store reference beside it (catalogue.InArtifactStore), the oldest kept in the single reference (ADR 0624 §1, §3), so mesh-build-go's seat-form answer no longer strands an engine stating nothing. Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig