nx_nishios_wm.nx

nx_nishios_wm.nx -- NishiOS GUI rung-2: a WINDOW MANAGER / COMPOSITOR. A desktop is more than one window: it's multiple windows composited in z-order over a wallpaper, with a mouse cursor on top. This draws a gradient wallpaper, two windows that OVERLAP (the higher-z one drawn last so it correctly occludes the lower one), a taskbar with buttons, and a shadowed arrow cursor above everything -- then exports the composite as a real BMP via the nx_fb library. KAT: z-order is correct (the overlap region shows the TOP window, not the bottom), the wallpaper is a real gradient (rows differ), the cursor is drawn on top, and the BMP is well-formed. HONEST SCOPE: a STATIC composite (one frame, fixed cursor). Live input (mouse/keyboard event loop), dragging, and wiring this framebuffer into the boot kernel are the next rungs. No hw writes (Rule 26). expect_exit: 0 license_tier: ORIGINAL