* fix: update logic to pull llama-cpp engine * chore: bump cortex version * fix: chat macos * chore: bump llama.cpp * chore: download windows * chore: download linux * chore: bump cortex to 1.0.13-rc6 * fix: stop cortex before exit * chore: bum llama.cpp engine to b5350 --------- Co-authored-by: vansangpfiev <sang@jan.ai>