llama.cpp b9839 release with Tailwind scanning fix and multi-platform binaries

The llama.cpp project has released version b9839, which includes a fix to restore Tailwind scanning in ignored worktrees. This update provides pre-built binaries for macOS, Linux, Android, Windows, and openEuler across various architectures and hardware acceleration backends.

• macOS Apple Silicon (arm64) and Intel (x64) builds are available, with KleidiAI support disabled.
• Linux binaries cover Ubuntu x64, arm64, and s390x for CPU, Vulkan, ROCm 7.2, OpenVINO, and SYCL FP32/FP16.
• Windows releases include CPU, OpenCL Adreno, CUDA 12.4, CUDA 13.3, Vulkan, OpenVINO, SYCL, and HIP variants.
• Android arm64 (CPU) binaries are provided alongside an iOS XCFramework and a general UI package.
• openEuler support is partially disabled, with active builds for x86 and aarch64 architectures using ACL Graph.

This release ensures users have access to the latest stable binaries across supported platforms and hardware configurations.