The code demo seeds its defect by pushing to master, and the fix only lands if
someone merges the pull request - which, by design, nobody does during a demo.
So master stays broken, and reset only printed "revert it before demoing"
while leaving it that way. The second run of the day then aborted on "defect
already present" before anything started.
Reset now reverts it on master. The substitution is anchored so it cannot
match an already-correct divisor, which keeps reset idempotent: running it on
a healthy repository changes nothing rather than corrupting the file.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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