Complete source 6 engineering workflows and preserve release validation evidence

crates/oa-desktop/src/app/checkpoints.rs

@@ -16,6 +16,7 @@ impl App {
             home::Event::New => self.handle(Message::Request(Pending::New)),
             home::Event::Open => self.handle(Message::Request(Pending::Open)),
             home::Event::Example => self.handle(Message::Request(Pending::Demo)),
+            home::Event::Walkthrough => self.handle(Message::Request(Pending::Walkthrough)),
             home::Event::Guide => self.update(Message::Page(Page::Guide)),
             home::Event::Resume => self.update(Message::Page(self.last_workspace_page)),
             home::Event::OpenRecent(path) => {
@@ -151,6 +152,7 @@ impl App {
         self.reset(restored.document.project().clone(), None);
         self.hosted.leave_document();
         self.document = restored.document;
+        self.migration = self.document.compiled().decoded.migration.clone();
         self.selected = if self.project().layer_of(restored.selected).is_some()
             || restored.selected == self.project().id
         {
@@ -184,7 +186,11 @@ impl App {
         } else {
             Page::Diagram
         };
-        self.status="Recovered an unsaved local copy. Choose Save as to save it; the original file and hosted model are unchanged.".into();
+        self.status = if self.migration.is_some() {
+            "Recovered source 5 as source 6 in an unsaved local copy. Draft text is preserved; workflow previews were rebuilt and semantic impact approvals need review. Choose Save as to save it."
+        } else {
+            "Recovered an unsaved local copy. Choose Save as to save it; the original file and hosted model are unchanged."
+        }.into();
         self.request_lint()
     }
 }
@@ -279,6 +285,28 @@ mod tests {
         assert!(Arc::ptr_eq(&accepted, &app.document.snapshot()));
     }
 
+    #[test]
+    fn walkthrough_request_keeps_unfinished_source_behind_the_normal_pending_guard() {
+        let mut app = App::with_project(Project::demo());
+        let accepted = app.document.snapshot();
+        let raw = format!(
+            "{}\nunfinished walkthrough draft",
+            app.source_workspace.text()
+        );
+        app.source_workspace
+            .edit(raw.clone(), app.source_editor.cursor());
+        let task = app.update(Message::Home(home::Event::Walkthrough));
+        assert!(matches!(app.pending, Some(Pending::Walkthrough)));
+        assert!(!app.busy);
+        assert!(iced_runtime::task::into_stream(task).is_none());
+        assert_eq!(app.source_workspace.text(), raw);
+        assert!(Arc::ptr_eq(&accepted, &app.document.snapshot()));
+        let _ = app.update(Message::Escape);
+        assert!(app.pending.is_none());
+        assert_eq!(app.source_workspace.text(), raw);
+        assert!(Arc::ptr_eq(&accepted, &app.document.snapshot()));
+    }
+
     fn retained_snapshot(app: &App) -> recovery::Snapshot {
         recovery::Snapshot::capture(
             app.canvas_document,