클래식 pygame GUI 이식

맥락:
- classic 게임을 사람이 플레이할 수 있도록 레거시 pygame GUI를 가져온다.
- 현재 GUI는 Python backend와 registry bot만 지원하고 Rust backend와 학습 checkpoint 로딩은 제외한다.

변경:
- pygame_pvp.py를 classic 패키지에 이식하고 tier, backend 선택, Deep CFR checkpoint 옵션을 제거했다.
- lost-cities-classic-gui 엔트리포인트와 README 실행 안내를 추가했다.
- GUI argparse smoke 테스트를 추가했다.

확인:
- uv run pre-commit run --all-files
- uv run pytest tests/games/classic
- uv run lost-cities-classic-gui --help
- SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy uv run python - <<'PY'
from coolrl_lost_cities.games.classic.pygame_pvp import LostCitiesGuiApp
app = LostCitiesGuiApp(mode='pvc', bot_name='random', seed=1, width=1024, height=768)
app.draw()
app.pygame.quit()
print('gui init ok')
PY

README.md

@@ -27,6 +27,15 @@ For future GUI work, install the optional GUI dependencies:
 uv sync --extra gui
 ```
 
+Run the classic pygame GUI:
+
+```bash
+uv run lost-cities-classic-gui --mode pvc --bot safe-heuristic
+```
+
+The GUI currently uses the Python backend only. The Rust core remains covered by
+parity tests and is not exposed as a GUI backend.
+
 ## Basic Usage
 
 ```python

pyproject.toml

@@ -19,6 +19,7 @@ gui = [
 
 [project.scripts]
 lost-cities-classic = "coolrl_lost_cities.games.classic:main"
+lost-cities-classic-gui = "coolrl_lost_cities.games.classic.pygame_pvp:main"
 
 [dependency-groups]
 dev = [

tests/games/classic/test_pygame_pvp.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import pytest
+
+from coolrl_lost_cities.games.classic import pygame_pvp
+
+
+def test_gui_argparser_accepts_classic_options() -> None:
+    args = pygame_pvp.build_argparser().parse_args(
+        [
+            "--mode",
+            "pvc",
+            "--bot",
+            "safe-heuristic",
+            "--seed",
+            "7",
+            "--width",
+            "1024",
+            "--height",
+            "768",
+        ]
+    )
+
+    assert args.mode == "pvc"
+    assert args.bot == "safe-heuristic"
+    assert args.seed == 7
+    assert args.width == 1024
+    assert args.height == 768
+
+
+def test_gui_argparser_rejects_removed_backend_option() -> None:
+    with pytest.raises(SystemExit):
+        pygame_pvp.build_argparser().parse_args(["--backend", "rust"])