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Stale branch causes pipeline failures not related to your change

The Issue

Your PR adds a login feature. CI fails a payment test. Your code did not touch payments.

Root Cause

Your branch is behind main. Someone else's merged change broke the payment tests. Now your CI picks up their broken code too.

How to Fix
  1. Rebase or merge main into your branch before pushing
  2. Enable branch protection: require branches to be up to date before merging
  3. Set up CI to always run against the merge result, not just your branch tip
  4. Communicate with the team about failing tests on main — fix main first