feat: position rotation every 10 games in self-play

--mix-rotate: 每10局轮换bot排列
[ISMCTS,ISMCTS,NEURAL] → [NEURAL,ISMCTS,ISMCTS] → [ISMCTS,NEURAL,ISMCTS]
Neural 三个位置都练到, 数据分布平衡
orchestrator改用--mix-rotate替换--mix

scripts/training_orchestrator.py

@@ -41,7 +41,7 @@ def selfplay(games):
     env['PATH'] = f"/usr/lib/dotnet:{env.get('PATH','')}"
     
     ok, out = run(['/usr/lib/dotnet/dotnet', 'run', '--project', 'hjha-console', '-c', 'Release',
-                   '--', '--mix', str(games)], to=max(36000, games*2))
+                   '--', '--mix-rotate', str(games)], to=max(36000, games*2))
     
     csv = len(glob.glob(os.path.join(td, 'game_*.csv')))
     sf = os.path.join(HJHA_DIR, 'stress_summary.txt')