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Add the PT-P900Wc with a 560px printhead and 360dpi resolution, using the P700 init sequence, PackBits raster, the print-information command and precut support. Verified printing on 36mm laminated tape. The existing 360dpi handling doubled the 180dpi tape widths, which is wrong for wide tapes: the 180dpi values are clamped by those printers' 128-pin printheads, not the true printable area. Add a separate px360 column with Brother's documented print areas (36mm = 454px, confirmed on hardware; the narrower widths are from the raster reference and untested) and clamp the result to max_px so 360dpi printers with a narrower head (PT-9200DX) stay safe. Also add the udev uaccess rule for 2085.