graph.json was pretty-printed (indent=2), so every PR that commits a
rebuilt graph reports tens of thousands of changed lines. GitHub's PR
line counts ignore .gitattributes (-diff, binary), so only the file's
content can fix it: one line of compact JSON is +1 -1.
Every writer of a project graph.json now emits separators=(",", ":")
with no indent: to_json, the `update` raw/no-cluster candidate text,
prune, merge-driver, merge-graphs, `extract --no-cluster` and the global
graph. Readers are unaffected.
`update` compares parsed data, not bytes, so an existing indented graph
would have been "unchanged" forever. It is now rewritten compact once,
then left alone.
Co-Authored-By: Claude <noreply@anthropic.com>
(cherry picked from commit 4c31235c37)
