"Not related to our changes" is an extraordinary claim that requires
extraordinary proof. When evals fail during /ship:
1. Run the same eval on main — prove it fails there too
2. If it passes on main, it IS your change — trace the blame
3. If you can't verify, say "unverified" not "pre-existing"
Added to CLAUDE.md and as a comment in skill-e2e.test.ts.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>