fix macOS build: pin Python <3.14, install SDL2 via brew

pygame has no pre-built wheels for Python 3.14 yet, causing source
builds to fail when SDL2 is absent. Pin requires-python to <3.14 and
add a .python-version file so uv picks 3.13 on all platforms. Also
install SDL2 deps via brew in setup.sh for macOS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: meltingscales

.python-version

@@ -0,0 +1 @@
+3.13

pyproject.toml

@@ -5,7 +5,7 @@ description = "Fighting games for goldfish with keyboards >:3c"
 authors = [{name = "henryfbp", email = "HenryFBP@gmail.com"}]
 readme = "README.md"
 keywords = ["pygame", "fighting-game", "tekken", "guilty-gear-strive"]
-requires-python = ">=3.8"
+requires-python = ">=3.8,<3.14"
 dependencies = [
     "json5>=0.9.6",
     "pygame>=2.1.2",

scripts/setup.sh

@@ -20,8 +20,9 @@ fi
 if [[ $platform == 'linux' ]]; then
   echo "Making sure required tools are installed."
   sudo apt-get install -y wmctrl
-else
-  echo "Not Linux, maybe OSX? Cannot install xdotool or wmctrl. Skipping."
+elif [[ $platform == 'darwin' ]]; then
+  echo "Making sure SDL2 is installed for pygame."
+  brew install sdl2 sdl2_image sdl2_mixer sdl2_ttf
 fi
 
 uv sync --group dev