debug: Add game loop health check logs

- Log when game loop starts
- Log every 5 seconds to confirm loop is running
- This will identify if the game loop is the issue

app.py

@@ -423,6 +423,7 @@ class ConnectionManager:
     
     async def game_loop(self):
         """Main game loop - runs at 20 ticks per second"""
+        print("🔄 Game loop STARTED")
         while self.active_connections:
             try:
                 # Update game state
@@ -487,6 +488,10 @@ class ConnectionManager:
         """Update game simulation - Red Alert style!"""
         self.game_state.tick += 1
         
+        # DEBUG: Log every 5 seconds to confirm game loop is running
+        if self.game_state.tick % 100 == 0:
+            print(f"⏱️  Game tick: {self.game_state.tick} (loop running)")
+        
         # Update superweapon charge (30 seconds = 1800 ticks at 60 ticks/sec)
         for player in self.game_state.players.values():
             if not player.superweapon_ready and player.superweapon_charge < 1800: