Each member's build is read at /v2/<module>/<artifact>/blobs/<digest> through the required provision artifact-store (bound to a file), checked against its digest and laid as the package it names: a Go module zip replaced in the temporary modfile, an npm tarball in node_modules. A mismatch or a store that does not answer fails the step naming the member. Builds: design 47 G §465, §373, §466 (lead answer A-151) Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h