Takes over #13841. A PR query refreshes on the server's refresh signal only while something reads it, and the server shares detail, activity, and preview for 60 seconds, or 10 minutes once merged.

Co-authored-by: Wout Stiens <71498452+StiensWout@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>