The fetch's single `package` and its tagged form go; `group-packages` lists each
TypeScript package a member's merge changes, at the member's head with its
directory there. The checker asks every member's other fetches first, so every
merge's changed paths are known before any TypeScript fetch, and gives each the
whole list; the registry's version stays only for a package no member changes.
Builds: design 47 G A-284, A-285
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
jschoubben
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