nx_gx1_browser3d_gate.nx

nx_gx1_browser3d_gate.nx -- Gx-1: sovereign SW-GPU 3D rendered INTO a Nishi-Browser framebuffer SURFACE. We paint our OWN browser chrome (title/nav bar, buttons, address field) + a content viewport into a raw RGB framebuffer, composite a z-buffered per-face-shaded 3D cube (transform->project->z-buffer, the same integer primitives as nx_swgpu/nx_gpu_geometry) into a page "3D element" region, and write a PNG via the canonical nx_png_write_rgb. Proves: OUR 3D raster composites into OUR browser surface, ZERO third-party (no WebGPU/WebGL/three.js/canvas). RESIDUAL (named, honest -> Gx-1b): wire nx_swgpu into nx_browser's LIVE layout path as a real <canvas>-class element so a fetched page drives it. license_tier: ORIGINAL expect_exit: 0