grouppackages is the Delivery SDK's (ADR 0634) and imports sdk/buildstep and sdk/trunk, not the deleted mesh-sdk/go/delivery. The checker's packagesFor lays the group's tagged versions (design 51) over grouppackages.Heads, so a heard tag still stands before a member's head; the composer and the trunk's manifest validator are built with no tags. Fetches carry the versions in buildstep.Fetch.Packages, so withPackages is gone; the group's fetch names no beside ref, so the test of the node-engine member beside reads its commit alone. Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i