What is the primary reason for the auspicious invocations (Mangalacharan) at the beginning of the Sai Satcharitra?

Chapter 1 of the Sai Satcharitra begins with auspicious invocations, or Mangalacharan, for a very specific purpose. As explained in the text, the reason for this auspicious beginning is to ensure the obstacle-free completion of the task of writing the book and to obtain the grace of the deities invoked. The author states that the purpose is the fulfillment of the desired goal, and by offering salutations to deities like Lord Ganesha, who holds an axe to destroy the obstacles of devotees, the author seeks to remove all impediments and successfully complete the sacred work of narrating Sai's life.