annulus-heldout

Held-out eval sets for the year-plugin project (same-source as 0X_filtered training, held out = not in training).

FY2001/heldout_2001_samesource.jsonl - 783 docs, all date=2001, same-source mix (common_corpus/USPTO/sec_edgar/arxiv). Use for FY2001 self-year absorption.
multiyear/eval_heldout.jsonl - ~10k docs, year/bucket_id/year_token, buckets 1500s..2000. Use for cross-year (far-year) cutoff.

Convention for later years

Add each new year's same-source held-out under FY<year>/heldout_<year>_samesource.jsonl (carved from that year's 0X_filtered repo, docs NOT used in training).