fix(geminiLive): T2 prompt durci + VAD réintégré, retrait SDK @google/genai

- Bug 1: prompt système T2 durci (13 règles absolues, interdiction du "?",
  rôle inerte) pour stopper la relance systématique. Réf TD-22.
- Bug 2: realtimeInputConfig (VAD automaticActivityDetection, 4 champs)
  réintégré dans le setup frame Gemini.
- Bug 8: @google/genai retiré + test-gemini-live.js supprimé (SDK abandonné
  au profit du WebSocket brut).

Tests 292/292 verts. Validé Golden Dataset Groupe D.

package-lock.json

@@ -8,7 +8,6 @@
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         "@hono/node-server": "^1.13.7",
         "@hono/node-ws": "^1.3.0",
         "@supabase/supabase-js": "^2.49.4",
@@ -542,29 +541,6 @@
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-      "resolved": "https://registry.npmjs.org/@google/genai/-/genai-1.50.1.tgz",
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-        "p-retry": "^4.6.2",
-        "protobufjs": "^7.5.4",
-        "ws": "^8.18.0"
-      },
-      "engines": {
-        "node": ">=20.0.0"
-      },
-      "peerDependencies": {
-        "@modelcontextprotocol/sdk": "^1.25.2"
-      },
-      "peerDependenciesMeta": {
-        "@modelcontextprotocol/sdk": {
-          "optional": true
-        }
-      }
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     "node_modules/@hono/node-server": {
       "version": "1.19.14",
       "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.14.tgz",
@@ -671,70 +647,6 @@
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       }
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@@ -1205,12 +1117,6 @@
         "undici-types": "~6.21.0"
       }
     },
-    "node_modules/@types/retry": {
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-      "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
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@@ -1369,15 +1275,6 @@
         "url": "https://opencollective.com/vitest"
       }
     },
-    "node_modules/agent-base": {
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-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
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-      "license": "MIT",
-      "engines": {
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     "node_modules/ansi-regex": {
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@@ -1436,35 +1333,6 @@
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       }
     },
-    "node_modules/base64-js": {
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-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
-      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT"
-    },
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@@ -1478,12 +1346,6 @@
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@@ -1585,19 +1447,11 @@
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@@ -1654,15 +1508,6 @@
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@@ -1769,12 +1614,6 @@
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@@ -1793,29 +1632,6 @@
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-      "funding": [
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-          "type": "github",
-          "url": "https://github.com/sponsors/jimmywarting"
-        },
-        {
-          "type": "paypal",
-          "url": "https://paypal.me/jimmywarting"
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-      "license": "MIT",
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@@ -1833,18 +1649,6 @@
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@@ -1869,34 +1673,6 @@
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@@ -2002,32 +1778,6 @@
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@@ -2090,19 +1840,6 @@
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+      "dev": true,
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     "node_modules/nanoid": {
@@ -2354,44 +2056,6 @@
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-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
-      "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
-      "deprecated": "Use your platform's native DOMException instead",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/jimmywarting"
-        },
-        {
-          "type": "github",
-          "url": "https://paypal.me/jimmywarting"
-        }
-      ],
-      "license": "MIT",
-      "engines": {
-        "node": ">=10.5.0"
-      }
-    },
-    "node_modules/node-fetch": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
-      "integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
-      "license": "MIT",
-      "dependencies": {
-        "data-uri-to-buffer": "^4.0.0",
-        "fetch-blob": "^3.1.4",
-        "formdata-polyfill": "^4.0.10"
-      },
-      "engines": {
-        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/node-fetch"
-      }
-    },
     "node_modules/object-inspect": {
       "version": "1.13.4",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
@@ -2404,19 +2068,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/p-retry": {
-      "version": "4.6.2",
-      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
-      "integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
-      "license": "MIT",
-      "dependencies": {
-        "@types/retry": "0.12.0",
-        "retry": "^0.13.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/package-json-from-dist": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/package-json-from-dist/-/package-json-from-dist-1.0.1.tgz",
@@ -2517,30 +2168,6 @@
         "node": "^10 || ^12 || >=14"
       }
     },
-    "node_modules/protobufjs": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.5.5.tgz",
-      "integrity": "sha512-3wY1AxV+VBNW8Yypfd1yQY9pXnqTAN+KwQxL8iYm3/BjKYMNg4i0owhEe26PWDOMaIrzeeF98Lqd5NGz4omiIg==",
-      "hasInstallScript": true,
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "@protobufjs/aspromise": "^1.1.2",
-        "@protobufjs/base64": "^1.1.2",
-        "@protobufjs/codegen": "^2.0.4",
-        "@protobufjs/eventemitter": "^1.1.0",
-        "@protobufjs/fetch": "^1.1.0",
-        "@protobufjs/float": "^1.0.2",
-        "@protobufjs/inquire": "^1.1.0",
-        "@protobufjs/path": "^1.1.2",
-        "@protobufjs/pool": "^1.1.0",
-        "@protobufjs/utf8": "^1.1.0",
-        "@types/node": ">=13.7.0",
-        "long": "^5.0.0"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      }
-    },
     "node_modules/qs": {
       "version": "6.15.1",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.1.tgz",
@@ -2566,15 +2193,6 @@
         "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
       }
     },
-    "node_modules/retry": {
-      "version": "0.13.1",
-      "resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
-      "integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 4"
-      }
-    },
     "node_modules/rollup": {
       "version": "4.60.1",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.60.1.tgz",
@@ -2620,26 +2238,6 @@
         "fsevents": "~2.3.2"
       }
     },
-    "node_modules/safe-buffer": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT"
-    },
     "node_modules/semver": {
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
@@ -3235,15 +2833,6 @@
         }
       }
     },
-    "node_modules/web-streams-polyfill": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
-      "integrity": "sha512-d2JWLCivmZYTSIoge9MsgFCZrt571BikcWGYkjC1khllbTeDlGqZ2D8vD8E/lJa8WGWbb7Plm8/XJYV7IJHZZw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",

package.json

@@ -11,7 +11,6 @@
     "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
-    "@google/genai": "^1.50.1",
     "@hono/node-server": "^1.13.7",
     "@hono/node-ws": "^1.3.0",
     "@supabase/supabase-js": "^2.49.4",

src/lib/__tests__/geminiLive.test.ts

@@ -81,8 +81,13 @@ describe("openGeminiLiveSession (raw WS)", () => {
     );
     expect(setup.setup.inputAudioTranscription).toEqual({});
     expect(setup.setup.outputAudioTranscription).toEqual({});
-    // ⚠ DEBUG : realtimeInputConfig (VAD) encore absent — prochain push.
+    // VAD réintégré (Sprint 6d Bug 2) — cf. IMPLEMENTATION_T2_LIVE.md §3 step 7.
-    expect(setup.setup.realtimeInputConfig).toBeUndefined();
+    expect(setup.setup.realtimeInputConfig.automaticActivityDetection).toEqual({
+      disabled: false,
+      startOfSpeechSensitivity: "START_SENSITIVITY_LOW",
+      endOfSpeechSensitivity: "END_SENSITIVITY_LOW",
+      silenceDurationMs: 2000,
+    });
   });
 
   it("forwarde un chunk audio client {type:'audio'} en realtimeInput vers Gemini", () => {

src/lib/geminiLive.ts

@@ -1,11 +1,11 @@
 /**
  * geminiLive.ts — Sprint 6d (revert WS brut).
  *
- * Le SDK `@google/genai` fermait la session sans setupComplete ni raison
+ * Historiquement, le proxy s'appuyait sur un SDK Gemini de haut niveau, mais
- * exploitable. On revient au WebSocket brut (package `ws`) qui était utilisé
+ * celui-ci fermait la session sans setupComplete ni raison exploitable. On
- * par `test-gemini-live.js` et permet de loguer précisément ce que Gemini
+ * utilise désormais le WebSocket brut (package `ws`), qui permet de loguer
- * répond. Config setup réduite au strict minimum tant que `setupComplete`
+ * précisément ce que Gemini répond et de maîtriser le contenu exact du setup
- * n'est pas confirmé en prod ; on réintègre champs un par un ensuite.
+ * frame (model, systemInstruction, transcriptions, VAD).
  *
  * Interface publique (consommée par `routes/t2live.ts`) — INCHANGÉE :
  *   - openGeminiLiveSession(clientWs, opts)
@@ -22,7 +22,7 @@ export const GEMINI_LIVE_URL =
 /**
  * Modèle Live cible. `gemini-2.0-flash-live-001` est le modèle Live confirmé
  * par la doc Google pour les clés API Developer + Express. Format `models/...`
- * dans le setup frame natif (cf. `test-gemini-live.js`).
+ * requis dans le setup frame natif.
  */
 export const GEMINI_LIVE_MODEL = "gemini-3.1-flash-live-preview";
 
@@ -41,22 +41,23 @@ export function buildT2SystemPrompt(input: {
   contexte: string;
 }): string {
   const { role, contexte } = input;
-  return `Tu es un examinateur du TCF Canada pour l'épreuve d'Expression Orale, Tâche 2 (dialogue interactif).
+  return `RÔLE : Tu incarnes ${role}.
-RÔLE : Tu incarnes ${role}.
 CONTEXTE : ${contexte}
+
 RÈGLES ABSOLUES :
 1. Tu parles TOUJOURS en français naturel et courant, niveau B2-C1.
-2. Tu NE corriges JAMAIS les erreurs du candidat.
+2. Tu NE corriges JAMAIS les erreurs du candidat. Tu continues naturellement.
 3. Tu attends que le candidat finisse sa question avant de répondre.
-4. Tes réponses sont courtes (15 à 25 mots maximum). Pas de monologue.
+4. Tes réponses sont courtes (15 à 25 mots maximum) pour laisser la place au dialogue.
 5. Ne donne pas toutes les informations d'un coup. Force le candidat à poser des questions précises.
-6. Si le candidat est vague, réponds brièvement sans chercher à compléter.
+6. Si le candidat est vague, réponds brièvement sans chercher à compléter — c'est à lui de reformuler.
-7. Ne pose JAMAIS de question après tes réponses. Tu réponds et tu te tais. La seule exception : si le candidat marque un long silence et semble avoir terminé, tu peux dire une seule fois « Si vous n'avez plus de questions, je vous souhaite une bonne journée » ou équivalent pour clore naturellement.
+7. STRICTE INTERDICTION DE POSER DES QUESTIONS. Tu n'as pas le droit d'utiliser de point d'interrogation. Tes phrases se terminent par un point.
-8. Ne prends jamais d'initiative pour orienter la conversation.
+8. SILENCE TOTAL APRÈS LA RÉPONSE. Réponds de manière factuelle, puis arrête-toi immédiatement. Ne suggère rien, ne relance pas, ne dis pas "et vous ?".
-9. Tu peux être légèrement pressé ou hésitant pour rendre l'échange réaliste.
+9. RÔLE PASSIF : tu es une source d'information inerte. Tu n'aides pas le candidat à tenir la conversation. S'il ne parle plus, le silence s'installe.
-10. JAMAIS de listes ni de structure numérotée dans tes réponses.
+10. AUCUNE FORMULE DE POLITESSE DE FIN : bannis "n'hésitez pas", "j'espère que ça vous aide", "qu'en pensez-vous ?".
-11. Ne mentionne jamais que tu es une IA ou un modèle.
+11. JAMAIS de listes ni de structure numérotée — parle naturellement.
-12. Tu ne prends PAS la parole en premier. Tu attends que le candidat s'adresse à toi.`;
+12. Ne mentionne jamais que tu es une IA ou un modèle.
+13. Tu ne prends PAS la parole en premier. Tu attends que le candidat s'adresse à toi.`;
 }
 
 /**
@@ -212,11 +213,10 @@ function tryParseGeminiJson(data: unknown): GeminiServerMessage | null {
 }
 
 /**
- * Construit le setup frame minimal Gemini Live (équivalent du mode
+ * Construit le setup frame Gemini Live : model + responseModalities AUDIO,
- * `minimal` de `test-gemini-live.js`). Les champs `systemInstruction`,
+ * systemInstruction (prompt T2), input/outputAudioTranscription, et
- * `inputAudioTranscription`, `outputAudioTranscription`,
+ * realtimeInputConfig.automaticActivityDetection (VAD : START/END_SENSITIVITY_LOW,
- * `realtimeInputConfig.automaticActivityDetection` sont volontairement
+ * 2 s de silence avant que l'IA réponde — cf. IMPLEMENTATION_T2_LIVE.md §3).
- * retirés tant que `setupComplete` n'est pas confirmé en prod.
  */
 function buildSetupFrame(systemPrompt: string): string {
   return JSON.stringify({
@@ -230,6 +230,14 @@ function buildSetupFrame(systemPrompt: string): string {
       },
       inputAudioTranscription: {},
       outputAudioTranscription: {},
+      realtimeInputConfig: {
+        automaticActivityDetection: {
+          disabled: false,
+          startOfSpeechSensitivity: "START_SENSITIVITY_LOW",
+          endOfSpeechSensitivity: "END_SENSITIVITY_LOW",
+          silenceDurationMs: 2000,
+        },
+      },
     },
   });
 }

test-gemini-live.js

@@ -1,150 +0,0 @@
-// test-gemini-live.js — Sprint 6d : debug du setup frame Gemini Live via SDK.
-//
-// Usage :
-//   node --env-file=.env test-gemini-live.js minimal
-//   node --env-file=.env test-gemini-live.js +system
-//   node --env-file=.env test-gemini-live.js +transcription
-//   node --env-file=.env test-gemini-live.js +vad
-//
-// Chaque mode part du `minimal` qui doit fonctionner avec une clé Express
-// Mode et ajoute UN champ. Si le mode reçoit `setupComplete` → le champ est
-// accepté. Si l'ouverture échoue → c'est ce champ qui pose problème.
-//
-// Migration Sprint 6d : passage du WebSocket brut au SDK officiel
-// `@google/genai` qui gère l'auth Express Mode automatiquement.
-
-import {
-  GoogleGenAI,
-  Modality,
-  StartSensitivity,
-  EndSensitivity,
-} from "@google/genai";
-
-const MODES = ["minimal", "+system", "+transcription", "+vad"];
-const mode = process.argv[2] ?? "minimal";
-if (!MODES.includes(mode)) {
-  console.error(
-    `❌ Mode inconnu : "${mode}". Modes valides : ${MODES.join(", ")}`,
-  );
-  process.exit(1);
-}
-
-const KEY = process.env.GEMINI_API_KEY;
-if (!KEY) {
-  console.error("❌ GEMINI_API_KEY manquante dans l'env");
-  process.exit(1);
-}
-
-// Modèle par défaut Sprint 6d. Fallback documenté : `gemini-2.0-flash-live-001`.
-const MODEL = "gemini-3.1-flash-live-preview";
-
-const SAMPLE_PROMPT =
-  "Tu joues le rôle d'un bailleur. Tu réponds uniquement en français. " +
-  "Tu attends que ton interlocuteur s'adresse à toi avant de parler.";
-
-function buildConfig(mode) {
-  // Base minimal — équivalent au mode `minimal` qui doit fonctionner.
-  const config = {
-    responseModalities: [Modality.AUDIO],
-  };
-
-  if (mode === "+system") {
-    config.systemInstruction = SAMPLE_PROMPT;
-  }
-
-  if (mode === "+transcription") {
-    config.inputAudioTranscription = {};
-    config.outputAudioTranscription = {};
-  }
-
-  if (mode === "+vad") {
-    config.realtimeInputConfig = {
-      automaticActivityDetection: {
-        disabled: false,
-        startOfSpeechSensitivity: StartSensitivity.START_SENSITIVITY_LOW,
-        endOfSpeechSensitivity: EndSensitivity.END_SENSITIVITY_LOW,
-        silenceDurationMs: 2000,
-      },
-    };
-  }
-
-  return config;
-}
-
-const ai = new GoogleGenAI({ vertexai: true, apiKey: KEY });
-
-console.log(`→ Mode : ${mode}`);
-console.log(`→ Modèle : ${MODEL}`);
-console.log("→ Connexion à Gemini Live (via SDK)…");
-
-let setupCompleteReceived = false;
-let resolved = false;
-
-const config = buildConfig(mode);
-console.log("→ Config envoyée :");
-console.log(JSON.stringify(config, null, 2));
-
-const timeoutId = setTimeout(() => {
-  if (!resolved) {
-    console.log("⏱  Timeout 15 s — pas de setupComplete reçu.");
-    process.exit(setupCompleteReceived ? 0 : 1);
-  }
-}, 15000);
-
-try {
-  const session = await ai.live.connect({
-    model: MODEL,
-    config,
-    callbacks: {
-      onopen: () => {
-        console.log("✅ Connexion ouverte");
-      },
-      onmessage: (msg) => {
-        // Compat : selon la version du SDK, setupComplete arrive soit comme
-        // propriété directe, soit dans serverContent. On loggue tout.
-        console.log("📨 Message reçu :", JSON.stringify(msg).slice(0, 600));
-        if (msg.setupComplete || msg?.serverContent?.setupComplete) {
-          setupCompleteReceived = true;
-          resolved = true;
-          console.log(
-            `\n🎉 [${mode}] ACCEPTÉ — setupComplete reçu (modèle ${MODEL}).`,
-          );
-          clearTimeout(timeoutId);
-          try {
-            session.close();
-          } catch {
-            /* ignore */
-          }
-          process.exit(0);
-        }
-      },
-      onerror: (err) => {
-        console.log("❌ Erreur :", err?.message ?? err);
-      },
-      onclose: (evt) => {
-        console.log(
-          `🔒 Fermeture${evt?.code ? ` — code ${evt.code}` : ""}${evt?.reason ? ` reason: ${evt.reason}` : ""}`,
-        );
-        if (!setupCompleteReceived) {
-          console.log(`\n⚠ [${mode}] REJETÉ — fermeture avant setupComplete.`);
-          console.log(
-            "→ Le ou les champs ajoutés par ce mode ne sont pas acceptés.",
-          );
-        }
-        resolved = true;
-        clearTimeout(timeoutId);
-        process.exit(setupCompleteReceived ? 0 : 1);
-      },
-    },
-  });
-  // Conserver la session vivante jusqu'au timeout/setupComplete.
-  void session;
-} catch (err) {
-  resolved = true;
-  clearTimeout(timeoutId);
-  console.log(
-    "❌ live.connect a échoué :",
-    err instanceof Error ? err.message : String(err),
-  );
-  process.exit(1);
-}