29b1d95acc
Word assignment: Replace nearest-center-distance with containment-first strategy. Words whose center falls within a column's bounds (+ 15% pad) are assigned to that column before falling back to nearest-center. This fixes long example sentences losing their rightmost words to adjacent columns. LLM review: Strengthen prompt to explicitly forbid changing proper nouns, place names, and correctly-spelled words. Add _is_spurious_change() post-filter that rejects case-only changes and hallucinated word replacements (< 50% character overlap). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>