[TUI math] Support matrices, nested fractions and integral limits

What gets counted gets built. Pile on.

Paste this into your agent. It files your request, with what you need it for.

I want this: rapsheet.dev/sheets/codex/issues/21804/file
Follow it to file my request. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends