Reference-style links broken in summaries

Links using the reference-style formatting...

```
This is [a link][1].
... rest of article
[1]:http://thelink.com
```

...are broken on summary views because the bottom of the article is truncated before being processed by Markdown.

Start by reproducing the reference-style link example on a summary view and trace where the article is truncated before Markdown processing. Identify the summary-rendering entry point from that path. Done means reference-style links render correctly in summaries without breaking the full article view.

Written by the indexing model from the issue text.