feat(core): export expands [[id]] wiki-links to readable labels

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/heph-core/src/sqlite/exporter.rs

@@ -23,9 +23,20 @@ pub(super) fn export(conn: &Connection, owner: &str, dir: &Path) -> Result<usize
 
     let mut count = 0;
     for id in ids {
-        let Some(node) = nodes::get(conn, &id)? else {
+        let Some(mut node) = nodes::get(conn, &id)? else {
             continue;
         };
+        // Expand bare [[NODEID]] links to [[NODEID|Current Name]] (§8.4) so the
+        // exported markdown reads outside heph; custom labels stay as-authored.
+        if let Some(body) = node.body.as_deref() {
+            node.body = Some(crate::wikilink::expand(body, |target| {
+                nodes::get(conn, target)
+                    .ok()
+                    .flatten()
+                    .filter(|n| !n.tombstoned && n.owner_id == owner)
+                    .map(|n| n.title)
+            }));
+        }
         let task = if node.kind == NodeKind::Task {
             tasks::get(conn, &id)?
         } else {

crates/heph-core/tests/export.rs

@@ -56,3 +56,24 @@ fn export_excludes_tombstoned_nodes() {
     assert!(dir.path().join(format!("doc/{}.md", keep.id)).exists());
     assert!(!dir.path().join(format!("doc/{}.md", gone.id)).exists());
 }
+
+#[test]
+fn export_expands_bare_id_wiki_links_to_readable_labels() {
+    let dir = tempfile::tempdir().unwrap();
+    let mut s = store();
+
+    let target = s.create_node(NewNode::doc("Roof", "shingles")).unwrap();
+    let body = format!(
+        "see [[{id}]] and [[{id}|my label]] and [[Unknown]]",
+        id = target.id
+    );
+    let doc = s.create_node(NewNode::doc("Notes", &body)).unwrap();
+
+    s.export(dir.path()).unwrap();
+    let text = std::fs::read_to_string(dir.path().join(format!("doc/{}.md", doc.id))).unwrap();
+    // Bare known id gains a readable label; a custom label and an
+    // unresolvable target are left as-authored.
+    assert!(text.contains(&format!("[[{}|Roof]]", target.id)), "{text}");
+    assert!(text.contains(&format!("[[{}|my label]]", target.id)));
+    assert!(text.contains("[[Unknown]]"));
+}