Add cached environment manager for exec server URL (#15785)

Add environment manager that is a singleton and is created early in
app-server (before skill manager, before config loading).

Use an environment variable to point to a running exec server.

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

@@ -77,6 +77,7 @@ use codex_arg0::Arg0DispatchPaths;
 use codex_core::config::Config;
 use codex_core::config_loader::CloudRequirementsLoader;
 use codex_core::config_loader::LoaderOverrides;
+use codex_exec_server::EnvironmentManager;
 use codex_feedback::CodexFeedback;
 use codex_protocol::protocol::SessionSource;
 use tokio::sync::mpsc;
@@ -383,6 +384,7 @@ fn start_uninitialized(args: InProcessStartArgs) -> InProcessClientHandle {
                 outgoing: Arc::clone(&processor_outgoing),
                 arg0_paths: args.arg0_paths,
                 config: args.config,
+                environment_manager: Arc::new(EnvironmentManager::from_env()),
                 cli_overrides: args.cli_overrides,
                 loader_overrides: args.loader_overrides,
                 cloud_requirements: args.cloud_requirements,

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

@@ -40,6 +40,7 @@ use codex_core::ExecPolicyError;
 use codex_core::check_execpolicy_for_warnings;
 use codex_core::config_loader::ConfigLoadError;
 use codex_core::config_loader::TextRange as CoreTextRange;
+use codex_exec_server::EnvironmentManager;
 use codex_feedback::CodexFeedback;
 use codex_protocol::protocol::SessionSource;
 use codex_state::log_db;
@@ -355,6 +356,7 @@ pub async fn run_main_with_transport(
     session_source: SessionSource,
     auth: AppServerWebsocketAuthSettings,
 ) -> IoResult<()> {
+    let environment_manager = Arc::new(EnvironmentManager::from_env());
     let (transport_event_tx, mut transport_event_rx) =
         mpsc::channel::<TransportEvent>(CHANNEL_CAPACITY);
     let (outgoing_tx, mut outgoing_rx) = mpsc::channel::<OutgoingEnvelope>(CHANNEL_CAPACITY);
@@ -620,6 +622,7 @@ pub async fn run_main_with_transport(
             outgoing: outgoing_message_sender,
             arg0_paths,
             config: Arc::new(config),
+            environment_manager,
             cli_overrides,
             loader_overrides,
             cloud_requirements: cloud_requirements.clone(),

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

@@ -66,6 +66,7 @@ use codex_core::default_client::get_codex_user_agent;
 use codex_core::default_client::set_default_client_residency_requirement;
 use codex_core::default_client::set_default_originator;
 use codex_core::models_manager::collaboration_mode_presets::CollaborationModesConfig;
+use codex_exec_server::EnvironmentManager;
 use codex_features::Feature;
 use codex_feedback::CodexFeedback;
 use codex_login::auth::ExternalAuthRefreshContext;
@@ -176,6 +177,7 @@ pub(crate) struct MessageProcessorArgs {
     pub(crate) outgoing: Arc<OutgoingMessageSender>,
     pub(crate) arg0_paths: Arg0DispatchPaths,
     pub(crate) config: Arc<Config>,
+    pub(crate) environment_manager: Arc<EnvironmentManager>,
     pub(crate) cli_overrides: Vec<(String, TomlValue)>,
     pub(crate) loader_overrides: LoaderOverrides,
     pub(crate) cloud_requirements: CloudRequirementsLoader,
@@ -194,6 +196,7 @@ impl MessageProcessor {
             outgoing,
             arg0_paths,
             config,
+            environment_manager,
             cli_overrides,
             loader_overrides,
             cloud_requirements,
@@ -217,6 +220,7 @@ impl MessageProcessor {
                     .features
                     .enabled(Feature::DefaultModeRequestUserInput),
             },
+            environment_manager,
         ));
         auth_manager.set_forced_chatgpt_workspace_id(config.forced_chatgpt_workspace_id.clone());
         auth_manager.set_external_auth_refresher(Arc::new(ExternalAuthRefreshBridge {

codex-rs/app-server/src/message_processor/tracing_tests.rs

@@ -24,6 +24,7 @@ use codex_core::config::Config;
 use codex_core::config::ConfigBuilder;
 use codex_core::config_loader::CloudRequirementsLoader;
 use codex_core::config_loader::LoaderOverrides;
+use codex_exec_server::EnvironmentManager;
 use codex_feedback::CodexFeedback;
 use codex_protocol::protocol::SessionSource;
 use codex_protocol::protocol::W3cTraceContext;
@@ -236,6 +237,7 @@ fn build_test_processor(
         outgoing,
         arg0_paths: Arg0DispatchPaths::default(),
         config,
+        environment_manager: Arc::new(EnvironmentManager::new(/*exec_server_url*/ None)),
         cli_overrides: Vec::new(),
         loader_overrides: LoaderOverrides::default(),
         cloud_requirements: CloudRequirementsLoader::default(),