b12143

<details open> vulkan: FWHT kernels for block widths above 512 (#29772) * vulkan: add F16 input to the FWHT The Vulkan FWHT accepts F32 input only. This adds an F16 source variant of the shader, for both the subgroup and the shared-memory paths, so the kernel reads an F16 source directly instead of requiring a converted copy. The F16 shader needs shader-float16, so the pipelines are only created when the device reports it. A null pipeline makes ggml_vk_can_use_fwht fall back, which is the same path an unsupported width already takes. supports_op and the dispatch both already route through ggml_vk_can_use_fwht, so there is a single place asking whether an op qualifies; nothing to consolidate here the way the CUDA/Metal ports needed. test-backend-ops on an M5 Pro (MoltenVK, fp16: 1): MUL_MAT 1128/1128, including all 24 Hadamard cases (18 existing F32, 6 new F16). Assisted-by: Codex * vulkan: FWHT kernels for block widths above 512 The Vulkan FWHT covers block widths 64 to 512; wider blocks fall back to the dense matmul. Extend the width list to 8192 and pick the shader per width: the subgroup shader keeps n/subgroup_size values per invocation, so widths above 512 (or a subgroup narrow enough to exceed 64 values per invocation) use the shared-memory shader with one row per workgroup and a 256-wide block. The rows per workgroup become a specialization constant so the dispatch matches. Pipelines for a width are only created when the device's shared-memory and workgroup-invocation limits allow it; otherwise that width keeps the fallback. This is the Vulkan counterpart to #29100 (CUDA). Stacked on #29101; the last commit is the one to review. 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