H: place a chosen PDF page (Image Import Options)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/designcraft-cli/src/perf.rs

@@ -183,6 +183,7 @@ pub fn synthetic(spec: &Spec) -> Document {
             d.assets.insert(
                 id,
                 Arc::new(Asset {
+                    page: 0,
                     id,
                     name: format!("art-{k}.png"),
                     mime: "image/png".into(),