chore: checkpoint stable battle and eidolon progression

internal/gameserver/dispatch.go

@@ -154,6 +154,8 @@ func hexDump(b []byte, max int) string {
 
 // DispatchMessage is the Go port of CommandHandler::on_message.
 func DispatchMessage(s *Session, cmdID uint16, payload []byte) {
+	s.stateMu.Lock()
+	defer s.stateMu.Unlock()
 	PacketLog(fmt.Sprintf("[PACKET RECV] cmd_id: %d %s (len: %d)", cmdID, goproto.NameByCmdID[cmdID], len(payload)))
 	Log(fmt.Sprintf("[PACKET] Received cmd_id: %d (%s)", cmdID, goproto.NameByCmdID[cmdID]))