Image modality bundle: 150-DPI page PNGs (1 per page), shared per-doc, mirrors PDF/MD bundles; HNs in [10,40]

README.md

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+# JSAJ eval bundle - IMAGE modality
+
+Each page rendered as one 150-DPI PNG. Page images are stored ONCE per distinct document under images/<doc>/pNNNN.png and referenced by each cell question.json (image_docs, in load order: source first, then distractors). 1350 cells, all hard negatives in [10,40] pages.