Add train/eval split + still_fail rescue (Qwen multi-attempt + Sonnet)

VLM judge→correct pass: fix reversed reading-order + hallucination(→EMPTY_IMAGE in correct_status), 7185 rows' ocr_revised corrected, add correct_status column

Deduplicate: drop 9489 near-identical duplicate blocks (text + crop-image match, kept 1 representative per cluster)

Apply reviewed OCR-revision improvements (pass-1: VLM-reviewer-flagged rows re-corrected & verified)

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