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NamedThingBench harness gains recall@k / recall@10 (the relational headline metric) on QuestionResult + FamilyReport, plus typed seed/linkTypes/kind on NamedThingQuestion so the graph-relationship family is machine-checkable. Adds the relational benchmark corpus (test/fixtures/retrieval-quality/ relational/): a small entity graph whose answers are LEXICALLY UNRECOVERABLE — every page body is generic and never names the entity it relates to, so only the typed edge connects query to answer. corpus.ts is the canonical source for both the seed loader and the 38-question gold set; relational.jsonl is generated from it (a drift test pins them equal). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>