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Split out of #1286 (Dehaze V3) so it can be reviewed and land on its own. `min_filter` / `max_filter` are separable van Herk / Gil-Werman filters: three comparisons per pixel per pass whatever the radius, edges clamped, NaNs skipped like f32::min, a short buffer or empty plane returned unchanged. `Image::transpose` (row-parallel) does the column pass. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>