fix(window): ensure SDL3/Wayland window is mapped by pumping events after ShowWindow

- Remove ALWAYS_ON_TOP and debug print hacks.
- Pump SDL events after SDL_ShowWindow so the Wayland compositor maps the window.
- Clean run.sh: do not force DISPLAY or SDL_VIDEODRIVER, let SDL3 auto-detect.

scripts/run.sh

@@ -11,13 +11,9 @@ ENGINE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 export DOTNET_ROOT="${DOTNET_ROOT:-$HOME/.dotnet}"
 export PATH="$DOTNET_ROOT:$PATH"
 
-# Prefer Wayland if available, fall back to X11
+# Auto-detect Wayland. SDL3 bundled with ppy.SDL3-CS supports both Wayland and X11;
-if [ -n "$WAYLAND_DISPLAY" ]; then
+# let it choose based on available display servers. Do NOT force DISPLAY here.
-    export SDL_VIDEODRIVER="${SDL_VIDEODRIVER:-wayland}"
+unset SDL_VIDEODRIVER 2>/dev/null
-else
-    export DISPLAY="${DISPLAY:-:0}"
-    export SDL_VIDEODRIVER="${SDL_VIDEODRIVER:-x11}"
-fi
 
 cd "$ENGINE_DIR"
 exec dotnet run --project "$ENGINE_DIR/src/CortexEngine.App/CortexEngine.App.csproj" -c Debug -- "$@"

src/Engine.Core/Sdl3Window.cs

@@ -46,6 +46,11 @@ public sealed unsafe class Sdl3Window : IWindow
 
         SDL3.SDL_ShowWindow(_window);
         SDL3.SDL_RaiseWindow(_window);
+
+        // On Wayland, the compositor needs an event round-trip before mapping
+        // the window. Pump events to flush the show request without blocking.
+        SDL_Event flushEvt;
+        while (SDL3.SDL_PollEvent(&flushEvt)) { }
     }
 
     public void PumpEvents()