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The initial build_grid_from_words() under-clusters to 1 column while _build_grid_core() correctly finds 4 columns (marker, EN, DE, example). Now extracts vocab from grid zones directly, with heuristic to skip narrow marker columns. Falls back to original cells if zones fail. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>