MANUAL RUN: codeSplitters mirrors on the real desktop app against a real GitHub repo #407

Mirrors (#393), and the private-line and rewritten-history work (#398, #402), were tested in the desktop runtime under Bun with a local bare repo as upstream. They haven't been tested in the built desktop app or against GitHub.

Steps for the owner:

• Ship it: zsh ~/release-codesplitters.sh (from any folder) so the site matches main. Mirrors are desktop-only, but the site is behind main anyway: /api, /api.html and /api/mcp all 404 live.
• Build or run the desktop app from main (cd apps/codesplitters && bun run desktop).
• Set git config --global user.name and user.email. Commits go up as that identity.
• Mirror a throwaway GitHub repo you own from the dig box (tick "Keep it in sync").
• Commit here and check it lands on GitHub. Push to GitHub and check it lands here.
• Force-push GitHub, then press Re-base on upstream. Repeat with Take upstream's.
• Make a line private, then press Push the crew's copy. Check that GitHub has the real text and the repo's own clone has the line blank.

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