fix(ocr-pipeline): remove overzealous grid row count validation

The validation that rejected word-center grid when it produced more rows
than gap-based detection was causing fallback to gap-based rows (large
boxes). The word-center grid regularization works correctly after the
center-based grouping and cluster merging fixes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

klausur-service/backend/cv_vocab_pipeline.py

@@ -1829,13 +1829,6 @@ def _regularize_row_grid(
     # Remove empty grid rows (no words assigned)
     grid_rows = [gr for gr in grid_rows if gr.word_count > 0]
 
-    # The grid must not produce MORE rows than gap-based detection.
-    # More rows means the clustering split actual lines — that's worse.
-    if len(grid_rows) > len(content_rows):
-        logger.info(f"RowGrid: grid produced {len(grid_rows)} rows > "
-                    f"{len(content_rows)} gap-based → keeping gap-based rows")
-        return rows
-
     # --- Step H: Merge header/footer + re-index ---
     result = list(non_content) + grid_rows
     result.sort(key=lambda r: r.y)