Web dashboard v2 step 1: public summaries, legacy issue fallback

Public issue pages and the Atom feed now carry each pick's summary and
'Why it's here' line (bodies, The Brief, World Briefing and comments stay
private). Issues stored before issues.issue_json existed rebuild their
colophon and Behind the paper from issues.report_json / the run row and
candidate_runs, and recover the World Briefing chapter from the EPUB on
disk. The dev seed mirrors that legacy shape.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NHyYupFdBiR4VfoUM7NjSM

src/web/public.rs

@@ -38,6 +38,8 @@ pub struct PublicEntry {
     pub domain: String,
     pub reading_minutes: i64,
     pub word_count: i64,
+    pub summary: Option<String>,
+    pub why: Option<String>,
     pub comment_links: Vec<CommentLink>,
     pub is_lead: bool,
 }
@@ -102,6 +104,20 @@ impl From<&Issue> for PublicIssue {
                                 domain: domain(&article.canonical_url),
                                 reading_minutes: article.reading_minutes(),
                                 word_count: article.word_count,
+                                summary: pick
+                                    .summary
+                                    .as_deref()
+                                    .or_else(|| {
+                                        issue
+                                            .editorial
+                                            .summaries
+                                            .get(&article.id)
+                                            .map(String::as_str)
+                                    })
+                                    .map(str::trim)
+                                    .filter(|summary| !summary.is_empty())
+                                    .map(str::to_string),
+                                why: pick.why.clone(),
                                 comment_links,
                                 is_lead: pick.is_lead,
                             }
@@ -356,16 +372,18 @@ mod tests {
     use super::*;
 
     #[test]
-    fn public_issue_carries_no_generated_text() {
+    fn public_issue_shows_summaries_and_why_but_no_bodies() {
         let source = crate::epub::fixtures::issue();
         let public = PublicIssue::from(&source);
         let html = FeedEntryTemplate { issue: &public }.render().unwrap();
         assert!(html.contains("The Lead Story"));
         assert!(html.contains("Hacker News"));
+        assert!(html.contains("What it argues, and why it is worth the time."));
+        assert!(html.contains("A short abstract for the second piece."));
+        assert!(html.contains("The systems story with enough operational detail to matter"));
+        assert!(html.contains("A small-scene delight outside the usual technical orbit"));
         for private in [
             "Two stories today",
-            "What it argues",
-            "systems story",
             "Body of",
             "write path",
             "Agreed",