v2: fix test.sh set -e bug that dropped reward=0 outcomes (RewardFileNotFoundError on failing solutions)

All 8728 verifiers: wrap pytest in set +e / capture PYTEST_EXIT / set -e so reward.txt is always written. Task content otherwise byte-identical to v1. Original preserved at tag v1.

tasks.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:398ee32b9ce123a3e37de15bcae209d181a617ade70c6e00c80bd369ac60e48d
-size 44033449
+oid sha256:7ff79d8470083caa6a947b265c237f0edae4de3d15d888b6b4775df49deff72a
+size 45632416