세션 평가·라이브코치·교수자 분석 라운드 마감 + 문서 정리 + 코드품질 리팩터

- 누적 작업트리 커밋: 회기 평가 복구·durable 저장, 라이브 코치 이력/근거, 교수자 학생분석, 음성 비언어 메타, PII 마스킹, 운영 티켓/헬스 등
- 문서: 완료 기록 docs/archive/ 냉동 보관, docs/ 단일 인덱스(docs/README.md)+통합 TODO(docs/TODO.md)로 정리
- 리팩터(행위 보존): Stage enum SSOT(taxonomy 소유·state_machine re-export), store recent/masked_turns 중복 제거, speaker_ko_label 단일 헬퍼, _list_sessions N+1 제거(state/turns 배치 + 턴평가 하이드레이션 배치)
- 검증: 백엔드 pytest 352 passed, _list_sessions E2E chromium-single-run 2 passed

apps/web/e2e/teacher.spec.ts

@@ -660,7 +660,21 @@ test.describe("teacher console", () => {
 
     const analysisPanel = page.locator('[data-learner-analysis-panel="true"]');
     await expect(analysisPanel).toBeVisible();
+    await expect(analysisPanel.getByRole("tab", { name: /^페르소나별 회기/ })).toHaveAttribute(
+      "aria-selected",
+      "true",
+    );
+    await expect(analysisPanel.locator('[data-learner-persona-group="true"]')).toHaveCount(2);
     await expect(analysisPanel.locator('[data-learner-session-row="true"]')).toHaveCount(0);
+    const personaGroup = analysisPanel
+      .locator('[data-learner-persona-group="true"]')
+      .filter({ hasText: "민재" });
+    await personaGroup.getByRole("button", { name: /P2 민재 회기 펼치기/ }).click();
+    await expect(analysisPanel.locator('[data-learner-persona-sessions="true"]')).toBeVisible();
+    await expect(
+      analysisPanel.locator('[data-learner-persona-sessions="true"]').getByText(`${learnerB}-session-2`),
+    ).toBeVisible();
+    await expect(analysisPanel.locator('[data-learner-session-row="true"]')).toHaveCount(1);
     await analysisPanel.getByRole("tab", { name: /^전체 회기/ }).click();
     await expect(analysisPanel.locator('[data-learner-session-row="true"]')).toHaveCount(2);
     await expect(analysisPanel.getByText(`${learnerB}-session-2`)).toBeVisible();
@@ -766,6 +780,89 @@ test.describe("teacher console", () => {
     await expectNoHorizontalOverflow(page);
   });
 
+  test("surfaces failed AI session evaluation in the teacher pending queue", async ({
+    page,
+  }) => {
+    const sessionId = "teacher-failed-ai-evaluation-session";
+    await page.route("**/api/teacher/dashboard", (route) =>
+      route.fulfill({
+        status: 200,
+        contentType: "application/json",
+        body: JSON.stringify({
+          source: "database",
+          cohort_label: "E2E cohort",
+          total_learners: 1,
+          active_sessions: 0,
+          ended_sessions: 1,
+          learner_growth: [],
+          safety_alerts: [],
+          pending_reviews: [
+            {
+              session_id: sessionId,
+              learner_id: "00000000-0000-0000-0000-000000000116",
+              learner_label: "하린",
+              persona_code: "P6",
+              persona_name: "하린",
+              session_no: 6,
+              status: "ended",
+              stage: "정리",
+              turn_count: 18,
+              learner_turn_count: 9,
+              client_turn_count: 9,
+              started_at: "2026-06-30T05:00:00Z",
+              ended_at: "2026-06-30T06:42:33Z",
+              review_status: "pending",
+              review_note: null,
+              reviewed_at: null,
+              evaluation_status: "error",
+              review_ready: false,
+              supervisor_state: "평가 실패",
+              evaluation_error: "session evaluation timeout after 45s",
+            },
+          ],
+          recent_sessions: [],
+          message: "교수자 검토 대기 회기가 있습니다.",
+        }),
+      }),
+    );
+    await page.route("**/api/personas/review", (route) =>
+      route.fulfill({
+        status: 200,
+        contentType: "application/json",
+        body: "[]",
+      }),
+    );
+    await page.route("**/api/auth/me", (route) =>
+      route.fulfill({
+        status: 200,
+        contentType: "application/json",
+        body: JSON.stringify({
+          user_id: "00000000-0000-0000-0000-000000000901",
+          email: "teacher@hs.ac.kr",
+          role: "teacher",
+          display_name: "E2E Teacher",
+          admin_access: false,
+          super_admin: false,
+          account_status: "approved",
+          approval_required: false,
+          cohort_ids: [],
+          consent_at: 1782820000,
+          onboarding_completed_at: 1782820001,
+          nickname: "E2E Teacher",
+          self_introduction: "",
+          avatar_url: "",
+        }),
+      }),
+    );
+
+    await page.goto("/teach");
+
+    const row = page.getByRole("button", { name: /하린 P6 회기 상세 검토/ });
+    await expect(row).toBeVisible();
+    await expect(row).toContainText("평가 실패");
+    await expect(row).toContainText("검토 대기");
+  });
+
   test("opens recent ended and active sessions from the teacher history @single-run", async ({
     page,
   }) => {