ggml: address 0cc4m review for Vulkan fused snake activation
snake.comp is renamed to follow the ggml DATA_A_* / A_TYPE convention. A_TYPE now applies to the activation tensor data_a instead of the broadcast multiplier, and the bindings become data_a (A_TYPE), data_b (float), data_c (float) and data_d (D_TYPE). A header at the top of the shader maps each buffer to its role in y = x + sin(b * x)^2 * c. On the C++ side, ggml_vk_can_fuse_snake reuses the existing snake_pattern constant instead of duplicating the op list, sin_node is extracted as a named local alongside the other chain nodes, and the broadcast operands a and inv_b are now required to be GGML_TYPE_F32 to match the hardcoded float bindings on data_b and data_c (the previous a->type == x->type would silently reject any future BF16 or F16 chain once the supports_op gate for SIN / SQR is lifted). ggml_vk_snake_dispatch_fused gets an explicit GGML_TYPE_F32 case and GGML_ABORT on default in place of the silent f32 fallback, and a stale comment about data_a[i1] / data_inv_b[i1] is refreshed to match the new binding names.
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Pascal