build(setup): leaner installs on Mac and Linux, cross-device store warning, setup-done marker (#22718)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
618761a2d6Theo Browne committed on 10/21/2026, 7:50:22 AM· committed by GitHubparentea1c494
5 files changedLine totals unavailable