Production Deploy fails: llms-full.txt contains MDX import statements #576

Production Deploy on main failed in the "Validate build output" step: https://github.com/OvertureMaps/docs/actions/runs/38621275159/job/116049567200

FAIL src/__tests__/llms-output.test.js > llms-full.txt build output > llms-full.txt does not contain MDX import statements
AssertionError: expected '# Overture Documentation\n\nThis file…' not to match /^import\s+.+from\s+['"]/m

Root cause: the Buildings guide has five MDX imports on one line (docs/guides/buildings/index.mdx, line 7). After the docusaurus-plugin-llms 0.6.0 to 0.6.1 bump, the plugin's excludeImports only strips an import that sits on its own line, so that line is left in llms-full.txt.

Reproduced locally on main with npm run build, then npx vitest run.