Function dequant_turbo3_block_to_bf16 

pub fn dequant_turbo3_block_to_bf16(
    raw: &[u8],
    bs: usize,
    nkv: usize,
    hd: usize,
    out: &mut [bf16],
)

Dequant a Turbo3 (3-bit packed) KV block to BF16.

Layout per block: data: bs * nkv * (hd * 3 / 8) bytes — 8 values packed in 3 bytes. scales: bs * nkv * (hd / NVFP4_GROUP_SIZE) bytes. Bit packing for 8 vals v0..v7 in 3 bytes b0,b1,b2 (mirrors kernels/gb10/common/paged_decode_attn_turbo3.cu:67-75): v0 = b0 & 0x7 v1 = (b0 >> 3) & 0x7 v2 = ((b0 >> 6) | (b1 << 2)) & 0x7 v3 = (b1 >> 1) & 0x7 v4 = (b1 >> 4) & 0x7 v5 = ((b1 >> 7) | (b2 << 1)) & 0x7 v6 = (b2 >> 2) & 0x7 v7 = (b2 >> 5) & 0x7