Developed foundational Musllibc initialization and basic threading support for the au-ts/lionsos repository, focusing on robust library self-initialization and improved compatibility with pthreads in single-threaded environments. The work involved implementing initialization routines in C, introducing a stub for set_tid_address to facilitate thread ID operations, and adjusting syscall return values to align with POSIX and pthreads expectations. Emphasis was placed on system programming and library development, laying the groundwork for future multi-threading features. No major bugs were reported during this period, reflecting a careful approach to reliability and cross-environment compatibility in operating system and library-level code.