Filter page-locator questions (300 -> 286 rows). Drops questions referencing specific pages (page N, on page X, first/cover page, page ranges) since markdown strips page boundaries.

Replace dataset with cleaned v2: 371 → 300 rows. Dropped unanswerable, page-reference, page-count, and missing-md questions. Source-of-truth for the 0/2/2 + random K-sweep context-degradation experiment.

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