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pandoc has been in the base since v1.0.0 but only as a front-end; PDF export (studio_export_pdf / pandoc -o out.pdf) failed with 'xelatex not found' because no back-end engine was installed. Ship typst (~30 MB static Rust binary, no LaTeX) as the default engine via `pandoc --pdf-engine=typst`, chosen over a ~600 MB TeX Live install. texlive-xetex remains the higher-fidelity install-on-demand fallback. - Dockerfile.base: install typst (latest GitHub-release idiom, pin via TYPST_VERSION); add xz-utils (typst ships .tar.xz); bump BASE_REBUILD_DATE. Lands in base-<hash>. - smoke-test.sh: verify typst + a real pandoc --pdf-engine=typst render. - README/AGENTS/CHANGELOG: typst now shipped (supersedes the planned :latest-studio-tex variant). No tag pushed — CI build intentionally deferred.