[RaphaelFakhri]

stripMdxSyntax() in src/utils/llms.ts removes MDX import statements and JSX tags with regular expressions that run over the whole file, including fenced code blocks. As a result, the /llms/*.txt exports drop code from examples:

• Every ESM example loses its import lines. For example, the first index.mjs sample in /llms/api-5x.txt starts with an empty line instead of import express from 'express';.
• Code that looks like a JSX tag is removed, for example Description=<Awesome Express App> in the systemd unit on the performance best practices page, and the <Alert> usage examples in the blog post guide.

This change sets fenced code blocks (backtick or tilde, optionally indented) aside before stripping MDX syntax and puts them back unchanged afterwards. Prose is processed exactly as before.

Testing

• Adds tests/unit/llms.test.mjs. Without the fix, 2 of its 3 tests fail. With the fix, all 3 pass.
• npm run test:unit: 68 tests pass.
• Running getRawMarkdown() before and after the change over every file in src/content: the only differences are lines inside fenced code blocks, which now match the source (2,420 restored import lines, plus the cases listed above).

Fixes #2561

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