diff --git a/tests/performance-and-robustness.e2e.spec.ts b/tests/performance-and-robustness.e2e.spec.ts
index 6122546..4b363d1 100644
--- a/tests/performance-and-robustness.e2e.spec.ts
+++ b/tests/performance-and-robustness.e2e.spec.ts
@@ -446,4 +446,95 @@ test.describe.serial('C. 鲁棒性测试', () => {
     L(`✅ 20次循环: ${success}/20 成功, 平均${Math.round(avg)}ms`);
     expect(success).toBeGreaterThanOrEqual(18);
   });
+
+  test('C-08 — 完整对话流程+自然AI评分（核心机能，不用force-end）', async () => {
+    const t = await AT();
+    const uname = 'z-nat-' + Date.now();
+    const cr = await fetch(`${API}/api/users`, {method:'POST', headers:{Authorization:`Bearer ${t}`,'Content-Type':'application/json'}, body:JSON.stringify({username:uname, password:'nat123'})});
+    const uid = (await cr.json()).user?.id;
+    await fetch(`${API}/api/v1/tenants/${TENANT_ID}/members`, {method:'POST', headers:{Authorization:`Bearer ${t}`,'Content-Type':'application/json'}, body:JSON.stringify({userId:uid, role:'USER'})});
+    const ut = await (async()=>{const r2=await fetch(`${API}/api/auth/login`, {method:'POST', headers:{'Content-Type':'application/json'},body:JSON.stringify({username:uname, password:'nat123'})}); return r2.ok?(await r2.json()).access_token:null;})();
+    expect(ut).toBeTruthy();
+    const L2 = (m: string) => L(m);
+
+    const sr = await fetch(`${API}/api/assessment/start`, {method:'POST', headers:{Authorization:`Bearer ${ut}`,'Content-Type':'application/json'}, body:JSON.stringify({templateId:TEMPLATE_ID, language:'zh'})});
+    const sd = await sr.json();
+    expect(sd.id).toBeTruthy();
+    const sid = sd.id;
+    const startTime = Date.now();
+
+    let questions: any[] = [];
+    for (let w = 0; w < 30; w++) {
+      const st = await fetch(`${API}/api/assessment/${sid}/state`, {headers:{Authorization:`Bearer ${ut}`}}).then(r=>r.json());
+      questions = st.questions || [];
+      if (questions.length > 0) break;
+      await new Promise(r => setTimeout(r,2000));
+    }
+    expect(questions.length).toBeGreaterThanOrEqual(4);
+    const genTime = Date.now() - startTime;
+    L2(`⏱ 出题: ${(genTime/1000).toFixed(1)}s (${questions.length}题)`);
+
+    // 逐题作答
+    let totalAnsMs = 0;
+    for (let qi = 0; qi < questions.length; qi++) {
+      const q = questions[qi];
+      const isChoice = q.questionType === 'MULTIPLE_CHOICE' || q.questionType === 'TRUE_FALSE';
+      const ans = isChoice ? (q.correctAnswer || 'A') : '完善的AI协作包含代码审查、安全边界、质量验证和责任划分四个方面。AI生成的代码必须经过人工审查，确保逻辑正确性和安全性。同时要建立持续改进的机制，将AI工具深度融入开发流程。';
+      await new Promise(r => setTimeout(r,1000));
+      const qs = Date.now();
+      const ar = await fetch(`${API}/api/assessment/${sid}/answer`, {method:'POST', headers:{Authorization:`Bearer ${ut}`,'Content-Type':'application/json'}, body:JSON.stringify({answer:ans, language:'zh'})});
+      expect(ar.ok).toBeTruthy();
+
+      // 等评分
+      await new Promise(r => setTimeout(r,3000));
+      const st = await fetch(`${API}/api/assessment/${sid}/state`, {headers:{Authorization:`Bearer ${ut}`}}).then(r=>r.json());
+      const qMs = Date.now() - qs;
+      totalAnsMs += qMs;
+
+      if (st.shouldFollowUp) {
+        L2(`  Q${qi+1}: ${isChoice?'MC':'SA'} ${(qMs/1000).toFixed(1)}s → 🔄 追问`);
+        await new Promise(r => setTimeout(r,2000));
+        await fetch(`${API}/api/assessment/${sid}/answer`, {method:'POST', headers:{Authorization:`Bearer ${ut}`,'Content-Type':'application/json'}, body:JSON.stringify({answer:'更加深入的分析：质量管理需要持续集成和自动化测试的配合。',language:'zh'})});
+        await new Promise(r => setTimeout(r,3000));
+      } else {
+        L2(`  Q${qi+1}: ${isChoice?'MC':'SA'} ${(qMs/1000).toFixed(1)}s`);
+      }
+    }
+
+    // 自然等待评分
+    L2(`⏳ 等待自然评分...`);
+    let waited = 0;
+    let finalSt: any = null;
+    for (let w = 0; w < 120; w++) {
+      const st = await fetch(`${API}/api/assessment/${sid}/state`, {headers:{Authorization:`Bearer ${ut}`}}).then(r=>r.json());
+      if (st.currentQuestionIndex! >= questions.length || st.report) { finalSt = st; break; }
+      await new Promise(r => setTimeout(r,2000));
+      waited += 2;
+    }
+    const totalTime = Date.now() - startTime;
+
+    if (!finalSt) {
+      L2(`⚠️ 评分等待超时(${waited}s), force-end`);
+      await fetch(`${API}/api/assessment/${sid}/force-end`, {method:'POST', headers:{Authorization:`Bearer ${ut}`}}).catch(()=>{});
+      await new Promise(r => setTimeout(r,3000));
+      finalSt = await fetch(`${API}/api/assessment/${sid}/state`, {headers:{Authorization:`Bearer ${ut}`}}).then(r=>r.json());
+    }
+
+    // 验证分数
+    const vals = Object.values(finalSt.scores || {}).filter((v:any) => typeof v === 'number') as number[];
+    const hasPositive = vals.some(v => v > 0);
+    expect(hasPositive).toBeTruthy();
+    L2(`📊 得分: ${vals.filter(v=>v>0).length}/${vals.length} 题 > 0分, 均值 ${(vals.reduce((a,b)=>a+b,0)/vals.length).toFixed(1)}`);
+
+    // 证书
+    if (hasPositive) {
+      const cert = await fetch(`${API}/api/assessment/${sid}/certificate`, {headers:{Authorization:`Bearer ${ut}`}}).then(r=>r.json());
+      L2(`📜 证书: 等级=${cert.level||'?'} 总分=${cert.totalScore??'?'}`);
+    }
+
+    L2(`━━━ 自然对话性能基线 ━━━`);
+    L2(`  出题: ${(genTime/1000).toFixed(1)}s  答题: ${(totalAnsMs/1000).toFixed(1)}s  评分等待: ${waited}s  总计: ${(totalTime/1000).toFixed(1)}s`);
+
+    await fetch(`${API}/api/users/${uid}`, {method:'DELETE', headers:{Authorization:`Bearer ${t}`}}).catch(()=>{});
+  });
 });