Stability Fix — System.Execute Steam update #1405020

Fixed a bug where production could permanently freeze if you were clicking fast or switching tabs. Before this patch, the only way to recover was restarting the game. Now the game loop catches errors and keeps going, and there's a background check that restarts it automatically if it ever stalls. If an error does get caught, you'll see a message in the terminal log. Shoutout to MAKAIROSI for reporting this one in the discussions. Also fixed a false "Leaderboard sync failed" message that could show up after prestiging. The leaderboard was actually fine, just noisy about it. All existing saves are fully compatible.