b0e1fbc8d6
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1. Filter recovered single-char artifacts (!, ?, •) from box zones
where they are decorative noise, not real text markers
2. Detect spanning header rows (e.g. "Unit4: Bonnie Scotland") that
stretch across multiple columns with colored text. Merge their
cells into a single spanning cell in column 0.
3. Fix missing opening parentheses: when cell text has ")" but no
matching "(", prepend "(" to the text.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>