feat(cph): add outline export command

crates/cph-typst/tests/compile.rs

@@ -134,6 +134,18 @@ fn augmented_manifest_has_outline_with_section_and_fields() {
     assert_eq!(fields_of(4), vec!["problem", "solution"]);
 }
 
+#[test]
+fn outline_pdf_renders_without_lesson_files() {
+    let lesson = load_mini();
+    let outline = lesson.outline_document();
+    let engine = Engine::with_render_dir(real_render_dir());
+    let pdf = engine
+        .build_outline_pdf(&outline)
+        .expect("outline PDF should compile");
+    assert!(pdf.starts_with(b"%PDF"), "output should be a PDF");
+    assert!(pdf.len() > 1_000, "outline PDF should be non-trivial");
+}
+
 /// THROUGH-TEMPLATE compile-check against the REAL render package: compiling the
 /// student template as main with the injected augmented manifest is clean (zero
 /// Error-severity diagnostics). This proves the template → manifest → include