fix(game-server): survive bad-packet exceptions in tick loop

Wrap world.Tick in try/catch so an incompatible/misaligned client packet
logs an error and the server keeps running (stable R&D bench).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Server.Game/Program.cs

@@ -63,9 +63,18 @@ internal static class Program
             Logger.Information("Server listening on :{Port}. Waiting for players…", port);
 
             while (await Tick.WaitForNextTickAsync())
+            {
+                try
                 {
                     world.Tick(TickRate);
                 }
+                catch (Exception ex)
+                {
+                    // A misaligned/incompatible client packet must not kill the whole server
+                    // (R&D: the client's exact net version isn't matched yet). Log and continue.
+                    Logger.Error(ex, "Tick error (bad packet?) — continuing");
+                }
+            }
         }
 
         Logger.Information("Shutting down");