[BUG] `mitex-cli` fails to compile a compilable typst file when missing aliases

[Yousa-Mirage]

Describe

When using mitex-cli to compile a LaTeX document containing standard environments like pmatrix into Typst code, the resulting Typst code fails to render. Typst throws an unknown variable: pmatrix error because the generated prelude lacks the corresponding #let binding for these environments.

To Reproduce

1. Create a minimal LaTeX file main.tex:

\begin{pmatrix}
    1 & 0 \\
    0 & 1
\end{pmatrix}

2. Compile it using mitex-cli:

mitex compile main.tex main.typ

3. The generated main.typ looks like this and fails to compile:

#import "@preview/mitex:0.2.6": *

// many aliases bindings like
// #let Big = mitex-scope.at("Big", default: none);

$ pmatrix(  // error: unknown variable: pmatrix
1  zws , 0  zws ;
0  zws , 1 
) $

But with Typst Package, this is fine:

#import "@preview/mitex:0.2.6": *
#mitex(`
  \begin{pmatrix}
      1 & 0 \\
      0 & 1
  \end{pmatrix}
`)

Expect

mitex-cli works well and could compile a compilable typst file.