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/post/single.html

@@ -5,6 +5,13 @@
   <p class="meta">{{ if not .Date.IsZero }}<time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "2 January 2006" }}</time>{{ end }}{{ with .GetTerms "author" }}{{ if not $.Date.IsZero }} · {{ end }}{{ partial "terms.html" (dict "page" $ "taxonomy" "author") }}{{ end }}</p>
   {{ with partial "banner.html" (dict "page" . "width" 1000) }}<img class="post-banner" src="{{ . }}" alt="">{{ end }}
   <div class="content">{{ .Content }}</div>
+  {{/* comments: the post's forum discussion, created by `make forum-sync` (data/forum_pages.json) */}}
+  {{ with and site.Params.forum.url .File (index (hugo.Data.forum_pages | default dict) .File.Path) }}
+  <section class="comments-section" id="comments" data-pagefind-ignore>
+    <h2>Comments</h2>
+    {{ partial "forum-thread.html" (dict "id" . "title" $.Title "note" "Log in to the forum to comment.") }}
+  </section>
+  {{ end }}
   <nav class="prev-next" data-pagefind-ignore>
     {{ with .PrevInSection }}<a href="{{ .RelPermalink }}">← {{ .Title }}</a>{{ end }}
     {{ with .NextInSection }}<a href="{{ .RelPermalink }}">{{ .Title }} →</a>{{ end }}