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* chart: bound scan conversion, spline points and category label bytes - The rasteriser tested every edge of a path at every sub-sample of every covered row. It now keeps an active-edge list (edges sorted by top, joining and leaving as the scan passes them), and one rasterize call has a total scan-work allowance after which remaining fills are skipped. - Smoothed lines budgeted interpolated points per run, so gap-separated short runs escaped both decimation and the cap. The budget is now shared by all runs of a line; once spent, runs are drawn through their data points. - Category labels copied every text value in full. Labels are clipped to 255 characters before copying, within an 8 MiB budget per series. * address review: chart raster and label budget fixes * address review: bound polyline point count before stroke_paths