feat(vela): start mocked response flow after push-to-talk commit

apps/vela-gateway/src/index.js

@@ -67,21 +67,23 @@ function scheduleMockedTurnStep(session, turnId, delay, callback) {
 	session.mockedTurnTimers.push(timer);
 }
 
-function startMockedTurn(socket, session) {
+function startMockedTurn(socket, session, { transcript = MOCKED_USER_TRANSCRIPT, includeListeningState = true } = {}) {
 	if (session.mockedTurnInFlight) {
 		sendSocketError(socket, 'mocked_turn_in_flight', 'Only one mocked turn can run per session at a time.');
 		return;
 	}
 
 	clearMockedTurn(session);
-	session.audioChunkCount = 0;
 	session.mockedTurnInFlight = true;
 	const turnId = crypto.randomUUID();
 	session.activeMockedTurnId = turnId;
-	updateSessionState(socket, session, 'listening');
+
+	if (includeListeningState) {
+		updateSessionState(socket, session, 'listening');
+	}
 
 	scheduleMockedTurnStep(session, turnId, 75, () => {
-		sendSocketMessage(socket, 'transcript.final', { text: MOCKED_USER_TRANSCRIPT });
+		sendSocketMessage(socket, 'transcript.final', { text: transcript });
 		updateSessionState(socket, session, 'thinking');
 	});
 
@@ -264,11 +266,12 @@ function handleClientMessage(socket, session, rawMessage) {
 				break;
 			}
 
-			sendSocketMessage(socket, 'transcript.final', {
-				text: createPlaceholderFinalTranscript(session.audioChunkCount)
-			});
+			const finalTranscript = createPlaceholderFinalTranscript(session.audioChunkCount);
 			session.audioChunkCount = 0;
-			updateSessionState(socket, session, 'idle');
+			startMockedTurn(socket, session, {
+				transcript: finalTranscript,
+				includeListeningState: false
+			});
 			break;
 		case 'response.cancel':
 			clearMockedTurn(session);