BLEND (.blend)

def is_blend(file_path: str) -> bool:
    """Check if file is a valid BLEND by magic bytes."""
    signature = bytes([0x42, 0x4C, 0x45, 0x4E, 0x44, 0x45, 0x52])
    with open(file_path, "rb") as f:
        return f.read(7) == signature

function isBLEND(buffer: Buffer): boolean {
  const signature = Buffer.from([0x42, 0x4C, 0x45, 0x4E, 0x44, 0x45, 0x52]);
  return buffer.subarray(0, 7).equals(signature);
}

func IsBLEND(data []byte) bool {
    signature := []byte{0x42, 0x4C, 0x45, 0x4E, 0x44, 0x45, 0x52}
    if len(data) < 7 {
        return false
    }
    return bytes.Equal(data[:7], signature)
}