Regenerate SmolLM2 slow-test references for transformers 5 / vllm 0.30
Regenerated on the CI T4 runner inside the pytorch 2.13 container. Only
arc:challenge acc moves beyond tolerance (0.4 -> 0.3, one of 10 samples);
truthfulqa_mc2 shifts by ~0.001. Also removes the temporary regeneration
steps from the workflow.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>