Track history notes thread hint outcomes (#42247)

## What changed

- Emit a `codex_thread_hint_status` analytics event for each native history-notes thread hint attempt.
- Report whether retrieval was successful or failed along with thread context and timing, without including hint contents.
- Treat valid empty responses as successful retrievals while continuing to omit them from the context window.

## Testing

- Extend the app-server history-notes tests to verify success, empty-result success, and backend failure statuses.

GitOrigin-RevId: b9462f312847e8c871ed2be0c8cf8df0928a7fdd

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

@@ -1,14 +1,11 @@
 use std::time::Duration;
 
 use anyhow::Result;
-use app_test_support::ChatGptAuthFixture;
 use app_test_support::MockResponsesConfig;
 use app_test_support::TestAppServer;
-use app_test_support::write_chatgpt_auth;
 use codex_app_server_protocol::ThreadStartParams;
 use codex_app_server_protocol::TurnStartParams;
 use codex_app_server_protocol::UserInput;
-use codex_config::types::AuthCredentialsStoreMode;
 use core_test_support::load_default_config_for_test;
 use core_test_support::responses;
 use pretty_assertions::assert_eq;
@@ -116,6 +113,7 @@ async fn app_server_uses_configured_notes_backend_for_context_window_hints(
 
     let codex_home = TempDir::new()?;
     MockResponsesConfig::new(&server.uri())
+        .with_root_config(&format!("chatgpt_base_url = \"{}\"", server.uri()))
         .with_model_provider("openai-custom")
         .with_provider_name("OpenAI")
         .with_provider_base_url(&format!("{}/backend-api/codex", server.uri()))
@@ -125,11 +123,7 @@ async fn app_server_uses_configured_notes_backend_for_context_window_hints(
             server.uri(),
         ))
         .write(codex_home.path())?;
-    write_chatgpt_auth(
-        codex_home.path(),
-        ChatGptAuthFixture::new("access-chatgpt"),
-        AuthCredentialsStoreMode::File,
-    )?;
+    mount_analytics_capture(&server, codex_home.path()).await?;
 
     let mut app_server = TestAppServer::builder()
         .with_codex_home(codex_home.path())
@@ -143,7 +137,7 @@ async fn app_server_uses_configured_notes_backend_for_context_window_hints(
     timeout(
         Duration::from_secs(10),
         app_server.start_turn_and_wait_for_completion(TurnStartParams {
-            thread_id: thread.id,
+            thread_id: thread.id.clone(),
             input: vec![UserInput::Text {
                 text: "inspect history and notes".to_string(),
                 text_elements: Vec::new(),
@@ -218,6 +212,22 @@ async fn app_server_uses_configured_notes_backend_for_context_window_hints(
             && item["name"] == "thread_hint"
     }));
 
+    if use_history_notes_extension {
+        let event = wait_for_matching_analytics_event(&server, DEFAULT_READ_TIMEOUT, |event| {
+            event["event_type"] == "codex_thread_hint_status"
+                && event["event_params"]["thread_id"] == thread.id
+        })
+        .await?;
+        assert_eq!(
+            event["event_params"]["status"],
+            if hint_status == 200 {
+                "succeeded"
+            } else {
+                "failed"
+            },
+        );
+    }
+
     Ok(())
 }