fix(cloud-tasks): respect cli_auth_credentials_store config (#5856)

## Problem

`codex cloud` always instantiated `AuthManager` with `File` mode,
ignoring the user's actual `cli_auth_credentials_store` setting. This
caused users with `cli_auth_credentials_store = "keyring"` (or `"auto"`)
to see "Not signed in" errors even when they had valid credentials
stored in the system keyring.

## Root cause

The code called `Config::load_from_base_config_with_overrides()` with an
empty `ConfigToml::default()`, which always returned `File` as the
default store mode instead of loading the actual user configuration.

## Solution

- **Added `util::load_cli_auth_manager()` helper**  
Properly loads user config via
`load_config_as_toml_with_cli_overrides()` and extracts the
`cli_auth_credentials_store` setting before creating `AuthManager`.

- **Updated callers**  
  - `init_backend()` - used when starting cloud tasks UI
  - `build_chatgpt_headers()` - used for API requests

## Testing

- ✅ `just fmt`
- ✅ `just fix -p codex-cloud-tasks`
- ✅ `cargo test -p codex-cloud-tasks`

## Files changed

- `codex-rs/cloud-tasks/src/lib.rs`
- `codex-rs/cloud-tasks/src/util.rs`

## Verification

Users with keyring-based auth can now run `codex cloud` successfully
without "Not signed in" errors.

---------

Co-authored-by: Eric Traut <etraut@openai.com>
Co-authored-by: celia-oai <celia@openai.com>

codex-rs/cloud-tasks/src/lib.rs

@@ -8,6 +8,7 @@ pub mod util;
 pub use cli::Cli;
 
 use anyhow::anyhow;
+use codex_login::AuthManager;
 use std::io::IsTerminal;
 use std::io::Read;
 use std::path::PathBuf;
@@ -56,20 +57,8 @@ async fn init_backend(user_agent_suffix: &str) -> anyhow::Result<BackendContext>
     };
     append_error_log(format!("startup: base_url={base_url} path_style={style}"));
 
-    let auth = match codex_core::config::find_codex_home()
-        .ok()
-        .map(|home| {
-            let store_mode = codex_core::config::Config::load_from_base_config_with_overrides(
-                codex_core::config::ConfigToml::default(),
-                codex_core::config::ConfigOverrides::default(),
-                home.clone(),
-            )
-            .map(|cfg| cfg.cli_auth_credentials_store_mode)
-            .unwrap_or_default();
-            codex_login::AuthManager::new(home, false, store_mode)
-        })
-        .and_then(|am| am.auth())
-    {
+    let auth_manager = util::load_auth_manager().await;
+    let auth = match auth_manager.as_ref().and_then(AuthManager::auth) {
         Some(auth) => auth,
         None => {
             eprintln!(

codex-rs/cloud-tasks/src/util.rs

@@ -2,6 +2,10 @@ use base64::Engine as _;
 use chrono::Utc;
 use reqwest::header::HeaderMap;
 
+use codex_core::config::Config;
+use codex_core::config::ConfigOverrides;
+use codex_login::AuthManager;
+
 pub fn set_user_agent_suffix(suffix: &str) {
     if let Ok(mut guard) = codex_core::default_client::USER_AGENT_SUFFIX.lock() {
         guard.replace(suffix.to_string());
@@ -54,6 +58,18 @@ pub fn extract_chatgpt_account_id(token: &str) -> Option<String> {
         .map(str::to_string)
 }
 
+pub async fn load_auth_manager() -> Option<AuthManager> {
+    // TODO: pass in cli overrides once cloud tasks properly support them.
+    let config = Config::load_with_cli_overrides(Vec::new(), ConfigOverrides::default())
+        .await
+        .ok()?;
+    Some(AuthManager::new(
+        config.codex_home,
+        false,
+        config.cli_auth_credentials_store_mode,
+    ))
+}
+
 /// Build headers for ChatGPT-backed requests: `User-Agent`, optional `Authorization`,
 /// and optional `ChatGPT-Account-Id`.
 pub async fn build_chatgpt_headers() -> HeaderMap {
@@ -69,31 +85,22 @@ pub async fn build_chatgpt_headers() -> HeaderMap {
         USER_AGENT,
         HeaderValue::from_str(&ua).unwrap_or(HeaderValue::from_static("codex-cli")),
     );
-    if let Ok(home) = codex_core::config::find_codex_home() {
-        let store_mode = codex_core::config::Config::load_from_base_config_with_overrides(
-            codex_core::config::ConfigToml::default(),
-            codex_core::config::ConfigOverrides::default(),
-            home.clone(),
-        )
-        .map(|cfg| cfg.cli_auth_credentials_store_mode)
-        .unwrap_or_default();
-        let am = codex_login::AuthManager::new(home, false, store_mode);
-        if let Some(auth) = am.auth()
-            && let Ok(tok) = auth.get_token().await
-            && !tok.is_empty()
+    if let Some(am) = load_auth_manager().await
+        && let Some(auth) = am.auth()
+        && let Ok(tok) = auth.get_token().await
+        && !tok.is_empty()
+    {
+        let v = format!("Bearer {tok}");
+        if let Ok(hv) = HeaderValue::from_str(&v) {
+            headers.insert(AUTHORIZATION, hv);
+        }
+        if let Some(acc) = auth
+            .get_account_id()
+            .or_else(|| extract_chatgpt_account_id(&tok))
+            && let Ok(name) = HeaderName::from_bytes(b"ChatGPT-Account-Id")
+            && let Ok(hv) = HeaderValue::from_str(&acc)
         {
-            let v = format!("Bearer {tok}");
-            if let Ok(hv) = HeaderValue::from_str(&v) {
-                headers.insert(AUTHORIZATION, hv);
-            }
-            if let Some(acc) = auth
-                .get_account_id()
-                .or_else(|| extract_chatgpt_account_id(&tok))
-                && let Ok(name) = HeaderName::from_bytes(b"ChatGPT-Account-Id")
-                && let Ok(hv) = HeaderValue::from_str(&acc)
-            {
-                headers.insert(name, hv);
-            }
+            headers.insert(name, hv);
         }
     }
     headers