fix(student-space): stabilize onboarding and voice capture

src/agents/mirror.prompt.md

@@ -22,6 +22,7 @@ If you'd find prior reflections useful — for example, you suspect the student
 
 ## Hard constraints
 
+- **English only.** Write every field in English unless the product explicitly passes a different language instruction.
 - **No diagnostic language.** Do not label the student's personality, ability, or identity. Describe what they did and what they said, never who they are.
 - **No advice.** Do not suggest what to do. That is not your job.
 - **No careers, no pathways.** That is Pathfinder's job.

src/agents/openai-realtime/mirror-payloads.ts

@@ -8,13 +8,43 @@ import LIVE_PROMPT_RAW from './mirror-realtime-live.prompt.md?raw'
 
 const MIRROR_JSON_SHAPE = '{"validation":"","inferred_meaning":"","story_reframe":""}'
 export const OPENAI_REALTIME_MIRROR_VOICE = 'marin'
+export const OPENAI_REALTIME_MIRROR_TRANSCRIPTION_LANGUAGE = 'en'
+export const OPENAI_REALTIME_MIRROR_TRANSCRIPTION_MODEL = 'gpt-4o-mini-transcribe'
 
 const LIVE_INSTRUCTIONS = LIVE_PROMPT_RAW.trim()
 
 export function buildRealtimeMirrorLiveInstructions(): string {
   return LIVE_INSTRUCTIONS
 }
 
+export function buildRealtimeMirrorLiveAudioInputConfig() {
+  return {
+    transcription: {
+      model: OPENAI_REALTIME_MIRROR_TRANSCRIPTION_MODEL,
+      language: OPENAI_REALTIME_MIRROR_TRANSCRIPTION_LANGUAGE,
+    },
+    noise_reduction: { type: 'far_field' },
+    turn_detection: {
+      type: 'server_vad',
+      create_response: false,
+      interrupt_response: true,
+      threshold: 0.5,
+      prefix_padding_ms: 700,
+      silence_duration_ms: 800,
+    },
+  } as const
+}
+
+export function buildRealtimeMirrorLiveResponseInstructions(): string {
+  return [
+    buildRealtimeMirrorLiveInstructions(),
+    '',
+    'The student has just finished one English voice turn.',
+    'Reply in English only.',
+    'Keep this spoken reply short and natural.',
+  ].join('\n')
+}
+
 export function buildRealtimeMirrorUserInput(transcript: string): string {
   return [
     'The student had this live voice session with the Companion while looking into the mirror scene.',
@@ -42,6 +72,7 @@ export function buildRealtimeMirrorRepairInput(previousText: string): string {
 export function buildRealtimeMirrorResponseInstructions(): string {
   return [
     'Use the latest student transcript item in this conversation.',
+    'Write every field in English.',
     'Return ONLY a JSON object with validation, inferred_meaning, and story_reframe.',
     `The object must match this shape: ${MIRROR_JSON_SHAPE}.`,
     'Do not ask a question. Do not give advice. Do not include Markdown.',

src/agents/openai-realtime/mirror-prompt.ts

@@ -4,15 +4,21 @@ import { fileURLToPath } from 'node:url'
 import type { RealtimeSessionCreateRequest } from 'openai/resources/realtime/realtime'
 import { OPENAI_REALTIME_MIRROR_DEFAULT_MODEL } from './config'
 import {
+  buildRealtimeMirrorLiveAudioInputConfig,
   buildRealtimeMirrorLiveInstructions,
+  OPENAI_REALTIME_MIRROR_TRANSCRIPTION_LANGUAGE,
+  OPENAI_REALTIME_MIRROR_TRANSCRIPTION_MODEL,
   OPENAI_REALTIME_MIRROR_VOICE,
 } from './mirror-payloads'
 
 export {
+  buildRealtimeMirrorLiveAudioInputConfig,
   buildRealtimeMirrorLiveInstructions,
   buildRealtimeMirrorRepairInput,
   buildRealtimeMirrorResponseInstructions,
   buildRealtimeMirrorUserInput,
+  OPENAI_REALTIME_MIRROR_TRANSCRIPTION_LANGUAGE,
+  OPENAI_REALTIME_MIRROR_TRANSCRIPTION_MODEL,
   OPENAI_REALTIME_MIRROR_VOICE,
 } from './mirror-payloads'
 
@@ -32,6 +38,7 @@ export function buildRealtimeMirrorInstructions(): string {
     getMirrorSystemPrompt(),
     '',
     '## Realtime session rules',
+    '- Always write the final Mirror JSON fields in English.',
     '- The student is not in an interview. Do not ask questions.',
     '- For voice input, listen until the app sends the explicit stop/commit event.',
     '- Return text only.',
@@ -61,22 +68,17 @@ export function buildRealtimeMirrorSessionConfig({
     output_modalities: [mode === 'live_audio' ? 'audio' : 'text'],
     max_output_tokens: 1000,
     audio: {
-      input: {
-        transcription: {
-          model: 'gpt-4o-mini-transcribe',
-          language: 'en',
-        },
-        noise_reduction: { type: 'near_field' },
-        turn_detection:
-          mode === 'live_audio'
-            ? {
-                type: 'semantic_vad',
-                create_response: true,
-                interrupt_response: true,
-                eagerness: 'auto',
-              }
-            : null,
-      },
+      input:
+        mode === 'live_audio'
+          ? buildRealtimeMirrorLiveAudioInputConfig()
+          : {
+              transcription: {
+                model: OPENAI_REALTIME_MIRROR_TRANSCRIPTION_MODEL,
+                language: OPENAI_REALTIME_MIRROR_TRANSCRIPTION_LANGUAGE,
+              },
+              noise_reduction: { type: 'far_field' },
+              turn_detection: null,
+            },
       ...(mode === 'live_audio' ? { output: { voice } } : {}),
     },
     tool_choice: 'none',

src/agents/openai-realtime/mirror-realtime-live.prompt.md

@@ -1,5 +1,7 @@
 You are a reflective journaling companion. Students talk with you in live conversation. You are a good listener who prompts when needed but uses very short and simple acknowledgments (hmm, nodding, short ack) and prompts to go deeper when needed.
 
+Always respond in English. If the student speaks in English, keep every spoken reply and follow-up in natural English. Do not switch to Indonesian, Malay, Singlish, or any other language unless the student explicitly asks to practice that language.
+
 ## Two modes
 
 You are always in one of two modes. Read the conversation to know
@@ -157,6 +159,14 @@ A student who slows down and goes quiet gets more space.
 
 If the student is checking whether the mic works: say only
   "I can hear you."
+If the student only says a very short or vague thing ("hi",
+  "hello", "I don't know", "nothing", "not sure", or one
+  unclear fragment), do not assume an event has already
+  happened. Do not ask "who were you with?", "where were you?",
+  or any detail that implies a story exists. Instead, invite
+  them gently toward school or after-school life:
+  "Anything interesting happen during school or after school today?"
+  Or: "Anything from school or after school still on your mind?"
 If the student asks what to talk about: give one simple
   invitation about something that happened recently,
   then leave space.

src/components/student-space/EngineHost.tsx

@@ -46,7 +46,17 @@ const SURFACES_REQUIRING_HYDRATION = new Set(['trajectory'])
  * is unsafe under SSR: some engine modules still expect a browser-owned
  * `window` / `document` during evaluation.
  */
-export function EngineHost({ className, children }: { className?: string; children?: ReactNode }) {
+export function EngineHost({
+  className,
+  children,
+  showOnboardingFlow = true,
+  hideCompanion = false,
+}: {
+  className?: string
+  children?: ReactNode
+  showOnboardingFlow?: boolean
+  hideCompanion?: boolean
+}) {
   const containerRef = useRef<HTMLDivElement | null>(null)
   const [error, setError] = useState<Error | null>(null)
   const backend = useMemo(() => createStudentSpaceBackendBridge(), [])
@@ -95,6 +105,18 @@ export function EngineHost({ className, children }: { className?: string; childr
     game.setRenderActive(isWorldRoute)
   }, [game, isWorldRoute])
 
+  useEffect(() => {
+    if (!game || !hideCompanion) return
+    const group = (game as unknown as { view?: { kira?: { group?: { visible: boolean } } } }).view
+      ?.kira?.group
+    if (!group) return
+    const previousVisible = group.visible
+    group.visible = false
+    return () => {
+      group.visible = previousVisible
+    }
+  }, [game, hideCompanion])
+
   useEffect(() => {
     document.body.classList.toggle('student-space-page-route', !isWorldRoute)
     return () => document.body.classList.remove('student-space-page-route')
@@ -255,7 +277,7 @@ export function EngineHost({ className, children }: { className?: string; childr
         <CaptureChooser />
         <AskSheet />
         <MoodSheet />
-        <OnboardingFlow />
+        {showOnboardingFlow ? <OnboardingFlow /> : null}
         {import.meta.env.DEV && game ? <CameraTuneBridge game={game} /> : null}
         {children}
       </EngineOverlayProvider>