MarkItDown test for sample-scientific.pdf

Input: sample-scientific.pdf

uv run markitdown "sample-scientific.pdf" -o "sample-scientific--markitdown-python.md"

--keep-data-uris: retains embedded images as base64 data URIs instead of truncating them, a meaningfully different (much larger) output.

uv run markitdown "sample-scientific.pdf" -o "sample-scientific--markitdown-python--keep-data-uris.md" --keep-data-uris