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civilytics_logo()/make_logo_grob() brand ggplot/grobs, but flextables and other outputs are rendered to PNG first and can't use them. stamp_logo_png() is the raster analogue: it resolves the SAME brand asset that make_logo_grob() uses (via the type/variant switch) and composites it into a corner of an existing PNG in place, so file-based tables stay visually consistent with logo-branded plots. Dependency-free by design — uses only png + grid + grDevices (all already imported), no magick. Configurable type/variant/position/width/margin; preserves the image's pixel dimensions. Adds tests (21 assertions).