nx_qabench_fetch_big.nx

nx_qabench_fetch_big.nx -- GROW the benchmark eval sets via pagination (the dynamic fetcher, proven). Pages the HF datasets-server offset/length API to fetch 300 rows each of SQuAD + HotpotQA into growing .raw files (concatenated page responses; the record-scanning parsers find records across pages). Bigger N = more robust F1. Run SOLO. expect_exit: 0 license_tier: ORIGINAL