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The max_columns parameter was only implemented in cv_words_first.py (vocab-worksheet path) but NOT in _build_grid_core which is what the admin OCR Kombi pipeline uses. The Kombi pipeline uses grid_editor_helpers._cluster_columns_by_alignment() which has its own column detection. Fix: Post-processing step 5k merges narrowest columns after grid building when zone has more columns than max_columns. Cells from merged columns get their text appended to the target column. min_conf word filtering was already working (applied before grid build). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>