fix: GPU display at correct resolution, clean up diagnostics

- Add GET_DISPLAY_INFO command to query QEMU's preferred resolution
  (was hardcoded 640x480, QEMU wanted 1280x800)
- Allocate framebuffer matching actual display dimensions
- Remove debug diagnostic output from display server and snake

crates/apps/snake/src/main.rs

@@ -14,7 +14,7 @@ use display_server::protocol::DisplayRequest;
 
 const INPUT_EP: CapSlot = CapSlot::const_new(0);
 const DISPLAY_EP: CapSlot = CapSlot::const_new(1);
-const TICK_DELAY: u64 = 2_000_000;
+const TICK_DELAY: u64 = 5_000_000;
 const MAX_RENDER_CMDS: usize = 140;
 
 fn display_send(req: &DisplayRequest) {
@@ -50,20 +50,17 @@ extern "C" fn main() {
         }
         flush();
 
-        wait_tick();
-        handle_input(&mut snake);
-        snake.tick();
-
         if snake.state() == GameState::GameOver {
             let gw = renderer::grid_pixel_width();
             let gh = renderer::grid_pixel_height();
-            draw_rect(gw / 2 - 60, gh / 2 - 12, 120, 24, 0xFF800000);
+            draw_rect(gw / 2 - 60, gh / 2 - 12, 120, 24, 0xFFCC0000);
             flush();
-
-            let end = Ticks::from_raw(syscall::get_time().raw() + 50_000_000);
-            while syscall::get_time().raw() < end.raw() { syscall::yield_now(); }
-            return;
+            loop { syscall::yield_now(); }
         }
+
+        wait_tick();
+        handle_input(&mut snake);
+        snake.tick();
     }
 }