The Qwen tokenizer and cross-encoder pre-downloads call the HF metadata
API to revalidate even on a cache hit; a 429 there propagates instead of
falling back to the cached files, failing CI on HF throttling.
Skip the pre-download steps when the cache is restored and run pytest
with HF_HUB_OFFLINE/TRANSFORMERS_OFFLINE on a hit, so cached models are
used without any network revalidation; allow online on a miss so a fresh
cache key still populates. Rename the cache key so the snapshot
re-populates with every test model (the old key predated the
cross-encoder step and never cached it).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
