Boundary text duplicated across slices (often with slightly different,
cropped transcriptions) survived the text-only merge. The OCR pass now
asks for a per-piece vertical position and the merge uses it:
- OcrResult gains optional `y` (fraction 0..1 of the slice); the Pass-A
OCR schema/prompt request it (combined path leaves it None). Not
persisted.
- merge_ocr takes each slice's working-image y-band and maps `y` to a
page-global position. A seam pair is a duplicate when position-close
(same kind) OR text-similar, so a mis-OCR'd boundary line is caught even
when the text differs. The kept copy is the one more central in its slice
(less cropped); falls back to keep-longer when positions are missing.
- Self-calibrates the model's y values (pixels vs. fraction) and ignores
degenerate columns, so a bad localizer can't over-merge.
Tests: position pairs differing texts and keeps the less-cropped copy;
text-only fallback (dedup/keep-longer/non-adjacent/order) still holds.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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