nx_browser_render_pe.nx

nx_browser_render_pe.nx -- R2/R3 proof: run the EXTRACTED CSS render organ (br_layout cascade+box-layout, br_draw_fb framebuffer paint) as a NATIVE WINDOWS PE. Reads _offc/nxhtml.html, lays it out, paints into an RGBA framebuffer, swaps to BGRA (Windows DIB order), and dumps the raw pixels to stdout (SW*SH*4 bytes) so a Windows-side blit can PNG it. Built through the fetch keystone (file-read + write + mmap thunks already present). Proves the layout+paint compiles + runs off-X11 on metal, the foundation for the GUI integration.