[diagnostics] show diagnostics earlier in workflow (#13604)

<img width="591" height="243" alt="Screenshot 2026-03-05 at 10 17 06 AM"
src="https://github.com/user-attachments/assets/84a6658b-6017-4602-b1f8-2098b9b5eff9"
/>

- show feedback earlier
- preserve raw literal env vars (no trimming, sanitizing, etc.)

codex-rs/tui/src/chatwidget.rs

@@ -1360,9 +1360,7 @@ impl ChatWidget {
             self.app_event_tx.clone(),
             category,
             self.current_rollout_path.clone(),
-            snapshot
-                .feedback_diagnostics_attachment_text(true)
-                .is_some(),
+            snapshot.feedback_diagnostics(),
         );
         self.bottom_pane.show_selection_view(params);
         self.request_redraw();