use-of-uninitialized-value in teken trim cursor pos

use-of-uninitialized-value in teken trim cursor pos: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function teken trim cursor pos in file libteken/teken.c