Add realtime output modality and transcript events (#17701)

- Add outputModality to thread/realtime/start and wire text/audio output
selection through app-server, core, API, and TUI.\n- Rename the realtime
transcript delta notification and add a separate transcript done
notification that forwards final text from item done without correlating
it with deltas.

codex-rs/tui/src/app/app_server_adapter.rs

@@ -385,7 +385,10 @@ fn server_notification_thread_target(
         ServerNotification::ThreadRealtimeItemAdded(notification) => {
             Some(notification.thread_id.as_str())
         }
-        ServerNotification::ThreadRealtimeTranscriptUpdated(notification) => {
+        ServerNotification::ThreadRealtimeTranscriptDelta(notification) => {
+            Some(notification.thread_id.as_str())
+        }
+        ServerNotification::ThreadRealtimeTranscriptDone(notification) => {
             Some(notification.thread_id.as_str())
         }
         ServerNotification::ThreadRealtimeOutputAudioDelta(notification) => {

codex-rs/tui/src/app_server_session.rs

@@ -657,6 +657,7 @@ impl AppServerSession {
                 request_id,
                 params: ThreadRealtimeStartParams {
                     thread_id: thread_id.to_string(),
+                    output_modality: params.output_modality,
                     prompt: params.prompt,
                     session_id: params.session_id,
                     voice: params.voice,

codex-rs/tui/src/chatwidget.rs

@@ -6272,7 +6272,8 @@ impl ChatWidget {
             | ServerNotification::FsChanged(_)
             | ServerNotification::FuzzyFileSearchSessionUpdated(_)
             | ServerNotification::FuzzyFileSearchSessionCompleted(_)
-            | ServerNotification::ThreadRealtimeTranscriptUpdated(_)
+            | ServerNotification::ThreadRealtimeTranscriptDelta(_)
+            | ServerNotification::ThreadRealtimeTranscriptDone(_)
             | ServerNotification::WindowsWorldWritableWarning(_)
             | ServerNotification::WindowsSandboxSetupCompleted(_)
             | ServerNotification::AccountLoginCompleted(_) => {}

codex-rs/tui/src/chatwidget/realtime.rs

@@ -7,6 +7,7 @@ use codex_protocol::protocol::RealtimeConversationClosedEvent;
 use codex_protocol::protocol::RealtimeConversationRealtimeEvent;
 use codex_protocol::protocol::RealtimeConversationStartedEvent;
 use codex_protocol::protocol::RealtimeEvent;
+use codex_protocol::protocol::RealtimeOutputModality;
 use codex_realtime_webrtc::RealtimeWebrtcEvent;
 use codex_realtime_webrtc::RealtimeWebrtcSession;
 use codex_realtime_webrtc::RealtimeWebrtcSessionHandle;
@@ -236,6 +237,7 @@ impl ChatWidget {
     ) {
         self.submit_op(AppCommand::realtime_conversation_start(
             ConversationStartParams {
+                output_modality: RealtimeOutputModality::Audio,
                 prompt: None,
                 session_id: None,
                 transport,
@@ -327,7 +329,9 @@ impl ChatWidget {
             }
             RealtimeEvent::InputAudioSpeechStarted(_) => self.interrupt_realtime_audio_playback(),
             RealtimeEvent::InputTranscriptDelta(_) => {}
+            RealtimeEvent::InputTranscriptDone(_) => {}
             RealtimeEvent::OutputTranscriptDelta(_) => {}
+            RealtimeEvent::OutputTranscriptDone(_) => {}
             RealtimeEvent::AudioOut(frame) => self.enqueue_realtime_audio_out(&frame),
             RealtimeEvent::ResponseCreated(_) => {}
             RealtimeEvent::ResponseCancelled(_) => self.interrupt_realtime_audio_playback(),