7b3319be2e
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OCR splits words at syllable marks into overlapping word_boxes (e.g.
"zu" + "tiefst" with 52% x-overlap). Step 5i previously removed the
lower-confidence box, losing the prefix. Now: when both boxes are
alphabetic text with 20-75% overlap, MERGE them into one word_box
("zutiefst") instead of removing.
Also relaxed artifact cell filter: 2-char alphabetic text like "Zw"
(dictionary guide word) is no longer removed. Only non-alphabetic
short text like "a=" is filtered.
Results for session 5997: "tiefst"→"zutiefst", "zu"→"zuständig",
"Zu die Zuschüsse"→"Zuschuss, die Zuschüsse", "Zw" restored.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>