Comments on news posts: one forum discussion per post

oc:pages command in the forum extension, tools/forum_sync.py and
'make forum-sync' (run by deploy) keep data/forum_pages.json up to date;
post pages end with their discussion.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

layouts/_partials/comments.html

@@ -5,13 +5,7 @@
 {{ if and $p.forum_thread site.Params.forum.url }}
 <section class="comments-section" id="comments" data-pagefind-ignore>
   <h2>Comments</h2>
-  {{ $thread := printf "%s/embed/%d" (strings.TrimSuffix "/" site.Params.forum.url) (int $p.forum_thread) }}
-  <p class="note">The first comments were left by visitors of the original site. Log in to the forum to add yours. <a href="{{ replace $thread "/embed/" "/d/" }}">Open this discussion in the forum</a>.</p>
-  <iframe class="forum-thread" id="forum-thread" src="{{ $thread }}" title="Comments on {{ .Title }}" loading="lazy"></iframe>
-  {{ with resources.Get "js/iframeResizer.min.js" | fingerprint }}
-  <script src="{{ .RelPermalink }}"></script>
-  <script>iFrameResize({ checkOrigin: false, heightCalculationMethod: "lowestElement" }, "#forum-thread");</script>
-  {{ end }}
+  {{ partial "forum-thread.html" (dict "id" $p.forum_thread "title" .Title "note" "The first comments were left by visitors of the original site. Log in to the forum to add yours.") }}
 </section>
 {{ else if $p.comments }}
 <section class="comments-section" id="comments" data-pagefind-ignore>