test: held-out retrieval eval — ranking generalizes (9/10), abstention doesn't (0/2) - #34
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…inding) Independent question set (firewalled generation per #24), unmodified eval, no ranker changes. Ranking generalizes; abstention threshold does not — filed as follow-up. Evidence artifact: fixture + HELDOUT-REPORT.md.
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Evidence artifact for #24: independently-generated question fixture + report. No lib changes — the honest record of what the held-out set found. Abstention fix tracked separately with anti-overfit validation protocol.