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The guided base, clarity band, texture band and dark channel (and the paired blurs inside the guided filter) are independent; each alone scales poorly (subsampled grids, short rows), so they now run under raster::par_join. Same arithmetic, identical pixels. render_bench gains a per-feature breakdown of the per-pixel stage (ONLY=finish). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>