build_node_fetch takes buildstep.FetchRequest (dir and paths narrow the workspace) and an
optional package {repository, commit, ref}: the group's package member, built and packed
shut off and published nowhere. Each member's lock decides its SDK: the group's packed
file when the version and integrity are the lock's, else the registry's (integrity
checked); a version the registry lacks fails waits for: @novox/mesh-sdk@<version>. A
package artifact is built by its own script and packed with npm pack, shut off; only a
trunk build publishes it, from this process with the write credential (never in a
workspace): absent is published, the same file is done, another is version taken:. The
registry configuration file now lies outside every workspace.