The fetch takes `group-packages` (a member's repository, commit, ref and the
package's directory there) in place of the single `package` and its tagged form;
it packs each package a module of the tree takes, publishing nothing, and places
it in every module whose package.json names it, the SDK in every module, in place
of the registry's whatever the lock names.
Builds: design 47 G A-284, A-285
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
jschoubben
64fa2f5abf