What historical and literary precedents are cited in the text to justify the tradition of writing a Guru's biography?

The text cites several precedents to establish the tradition of writing a Guru's biography. Chapter 0 mentions that the practice is very ancient, with its service being mentioned in the Narada Purana. Within the literary tradition of Maharashtra, it references the famous poets Maharaj Shri Mahipati and Shri Dasganu Maharaj, who wrote biographies of saints in the Ovi meter. Furthermore, it points to the 'Brihat or Thorale Guru Charitra,' a sweet and graceful biography of Shri Narsimha Saraswati Maharaj, as a famous, ancient, and detailed work that was widely studied, setting a clear precedent for a comprehensive work like the 'Shri Sai Satcharita'.