A head tested alone keeps failing harnesses that main already fixed. Since 10-25 evening, 9 of 21 failed PR
parity jobs failed only on such fixes: server_knockback (heads without #2114, 7 times), mob_ai's oracle heap
(without #2270), save_roundtrip (without #2212). #2160 needed 4 parity runs this way.
The job now merges main's current tip into the head and selects harnesses against that main commit, so only
the pull request's own changes count. A branch that doesn't change the runner scripts or the selection gets
main's, which replaces the two steps that copied main's vanilla-data.sh and parity.py in by hand. A head that
conflicts with main is tested alone, with a warning. The job summary names the main commit, and the check is
still `parity / parity` on the head.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie
df045f1e9a