Fix missing closing parenthesis in repr() of an untitled Game

ChangeLog

@@ -22,6 +22,10 @@
   and of payoffs, beliefs and regrets of mixed behavior profiles on large game trees.  Path
   following (logit and hp) also spends about half as long factorizing Jacobians.  (#1162)
 
+### Fixed
+- `repr()` of a `Game` with an empty title was missing its closing parenthesis
+  (`Game(id=...` instead of `Game(id=...)`).
+
 ## [17.0.0-beta.1] - 2026-09-08
 
 ### Added

src/pygambit/game.pxi

@@ -102,7 +102,7 @@ class Game:
         if self.title:
             return f"Game(title='{self.title}')"
         else:
-            return f"Game(id={hash(self)}"
+            return f"Game(id={hash(self)})"
 
     def _repr_html_(self):
         if isinstance(self, ExtensiveGame):

tests/test_game.py

@@ -107,3 +107,21 @@ def test_collection_rejects_integer_indexing(getter):
     collection = getter(games.create_stripped_down_poker_efg())
     with pytest.raises(TypeError):
         _ = collection[0]
+
+
+@pytest.mark.parametrize(
+    "game",
+    [
+        pytest.param(gbt.StrategicGame([2, 2], title=""), id="strategic"),
+        pytest.param(gbt.ExtensiveGame(["1", "2"], title=""), id="extensive"),
+    ],
+)
+def test_repr_untitled_game(game):
+    # A game without a title is represented by its identity; the representation
+    # must be well-formed (closing parenthesis included), just as for titled games.
+    assert repr(game) == f"Game(id={hash(game)})"
+
+
+def test_repr_titled_game():
+    game = gbt.StrategicGame([2, 2], title="Coordination")
+    assert repr(game) == "Game(title='Coordination')"