Interim, for the lead's ruling: ADR 0625 §1 cuts the registry part into each registry seat's own Go module, and §3 lets no mesh-sdk package but catalogue import a contracts module; this helper is logic shared over a seat, a client in §4's sense, which no clause lets the registry milestone build. Kept building meanwhile. Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig