Add marketplace display names to plugin/list (#14861)

Add display_name support to marketplace.json.

codex-rs/app-server/src/codex_message_processor.rs

@@ -5452,6 +5452,7 @@ impl CodexMessageProcessor {
                     .map(|marketplace| PluginMarketplaceEntry {
                         name: marketplace.name,
                         path: marketplace.path,
+                        display_name: marketplace.display_name,
                         plugins: marketplace
                             .plugins
                             .into_iter()

codex-rs/app-server/tests/suite/v2/plugin_list.rs

@@ -152,6 +152,7 @@ async fn plugin_list_includes_install_and_enabled_state_from_config() -> Result<
         repo_root.path().join(".agents/plugins/marketplace.json"),
         r#"{
   "name": "codex-curated",
+  "display_name": "ChatGPT Official",
   "plugins": [
     {
       "name": "enabled-plugin",
@@ -220,6 +221,10 @@ enabled = false
         .expect("expected repo marketplace entry");
 
     assert_eq!(marketplace.name, "codex-curated");
+    assert_eq!(
+        marketplace.display_name.as_deref(),
+        Some("ChatGPT Official")
+    );
     assert_eq!(marketplace.plugins.len(), 3);
     assert_eq!(marketplace.plugins[0].id, "enabled-plugin@codex-curated");
     assert_eq!(marketplace.plugins[0].name, "enabled-plugin");