Fix Ants PR CI: ruff import order + format, and single-player commit_label default

- Sort AntsArena import (ruff isort) and reformat replay.py (ruff format)
- single_player: default commit_label to '' (fixes test_single_player_battlesnake KeyError)

Author: john-b-yang

codeclash/arenas/__init__.py

@@ -1,5 +1,5 @@
-from codeclash.arenas.arena import CodeArena
 from codeclash.arenas.ants.ants import AntsArena
+from codeclash.arenas.arena import CodeArena
 from codeclash.arenas.battlecode23.battlecode23 import BattleCode23Arena
 from codeclash.arenas.battlecode24.battlecode24 import BattleCode24Arena
 from codeclash.arenas.battlecode25.battlecode25 import BattleCode25Arena

codeclash/arenas/ants/replay.py

@@ -120,7 +120,12 @@ def parse(self, raw: bytes, players: list[dict] | None = None) -> ReplayData:
             names.append(f"player{len(names) + 1}")
 
         frames = [
-            {"turn": fr.get("t", idx), "ants": fr.get("ants", []), "hills": fr.get("hills", []), "food": fr.get("food", [])}
+            {
+                "turn": fr.get("t", idx),
+                "ants": fr.get("ants", []),
+                "hills": fr.get("hills", []),
+                "food": fr.get("food", []),
+            }
             for idx, fr in enumerate(log.get("frames", []))
         ]
 

codeclash/tournaments/single_player.py

@@ -62,6 +62,9 @@ def get_game_context(self, agent_config: dict, *, round: int) -> GameContext:
 
     def get_agent(self, agent_config: dict, round: int) -> Player:
         """Create an agent with environment and game context."""
+        # Commit/tag messages are prefixed with `commit_label` (see Player._round_message);
+        # single-player has no rung/opponent prefix, so default it to empty (as PvP does).
+        agent_config.setdefault("commit_label", "")
         environment = self.game.get_environment(f"{self.game.game_id}.{agent_config['name']}")
         game_context = self.get_game_context(agent_config, round=round)
         return get_agent(agent_config, game_context, environment)