Find the Bad Commit

Track down the commit that introduced a bug.

A advanced Git challenge worth 20 points. Solve it hands-on in a real Git environment in your browser - no local setup, no fake shells.

The Challenge

Scenario: The word FORBIDDEN was added to marker.txt somewhere in history and broke things.

Task: Find the FIRST commit that introduced it (use git bisect or git log -S) and write its short hash to /tmp/answer.txt.