Align PR review card with "Wake up to results" theme (#912)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jamesadevine <4742697+jamesadevine@users.noreply.github.com>

Author: Copilot

site/src/content/docs/index.mdx

@@ -82,7 +82,7 @@ Vulnerabilities patched. Docs updated. Broken builds diagnosed and fixed. By the
     Stale issues get flagged, duplicates get linked, and priorities get suggested -- every day.
   </Card>
   <Card title="Codebase-aware PR review" icon="comment">
-    An agent reviews every pull request against your codebase's conventions, flagging regressions and suggesting fixes inline.
+    Pull requests opened overnight are reviewed against your codebase's conventions, so inline feedback on regressions and fixes is waiting by morning.
   </Card>
   <Card title="Dependency governance" icon="puzzle">
     Flagged components get triaged, vulnerable dependencies get patched, and upgrade PRs land before the next audit.