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/api/app/test_learner_dashboard.py

@@ -113,9 +113,9 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         with (
             patch.object(
                 sessions.session_persistence,
-                "list_sessions",
+                "list_recent_sessions",
                 AsyncMock(return_value=(owned_sessions, True)),
-            ) as list_sessions,
+            ) as list_recent_sessions,
             patch.object(
                 sessions.session_persistence,
                 "load_session_evaluation",
@@ -129,7 +129,7 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         ):
             response = await sessions.learner_dashboard(principal)
 
-        list_sessions.assert_awaited_once_with(principal, include_turn_evaluation=True)
+        list_recent_sessions.assert_awaited_once_with(principal, include_turn_evaluation=True)
         list_session_archives.assert_awaited_once_with(
             [sess.session_id for sess in owned_sessions],
             principal,
@@ -155,6 +155,59 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         self.assertEqual(len(response.recent_feedback), 3)
         self.assertIn("근거 기반 피드백", response.recent_feedback[0].note)
 
+    async def test_dashboard_excludes_failed_fast_loop_evaluations_from_growth_and_feedback(self) -> None:
+        principal = _principal()
+        good_session = _session(
+            session_id="00000000-0000-0000-0000-00000000b211",
+            session_no=1,
+            persona_code=P1.code,
+            score="pos",
+            rapport=0.5,
+            technique="reflection",
+            created_at=1_000.0,
+        )
+        failed_session = _session(
+            session_id="00000000-0000-0000-0000-00000000b212",
+            session_no=2,
+            persona_code=P1.code,
+            score="neutral",
+            rapport=0.2,
+            technique="failed evaluator",
+            created_at=2_000.0,
+        )
+        failed_eval = failed_session.turns[0].evaluation
+        assert failed_eval is not None
+        failed_eval["error"] = "engine_error"
+        failed_eval["appropriateness_note"] = "이 문장은 최근 피드백에 노출되면 안 됩니다."
+        failed_eval["techniques"] = []
+
+        with (
+            patch.object(
+                sessions.session_persistence,
+                "list_recent_sessions",
+                AsyncMock(return_value=([good_session, failed_session], True)),
+            ),
+            patch.object(
+                sessions.session_persistence,
+                "load_session_evaluation",
+                AsyncMock(return_value=({"status": "ready"}, True)),
+            ),
+            patch.object(
+                sessions.session_persistence,
+                "list_session_archives",
+                AsyncMock(return_value=({}, True)),
+            ),
+        ):
+            response = await sessions.learner_dashboard(principal)
+
+        self.assertEqual(response.growth.evaluated_sessions, 1)
+        self.assertEqual(response.growth.first_score, 1.0)
+        self.assertEqual(response.growth.latest_score, 1.0)
+        self.assertEqual(response.growth.avg_score, 1.0)
+        self.assertEqual(len(response.recent_feedback), 1)
+        self.assertIn("reflection 근거 기반 피드백", response.recent_feedback[0].note)
+        self.assertNotIn("노출되면 안 됩니다", response.model_dump_json())
+
     async def test_session_list_marks_archived_rows_from_learner_archive_state(self) -> None:
         principal = _principal()
         owned_sessions = [
@@ -190,9 +243,9 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         with (
             patch.object(
                 sessions.session_persistence,
-                "list_sessions",
+                "list_recent_sessions",
                 AsyncMock(return_value=(owned_sessions, True)),
-            ) as list_sessions,
+            ) as list_recent_sessions,
             patch.object(
                 sessions.session_persistence,
                 "list_session_archives",
@@ -202,7 +255,7 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         ):
             response = await sessions.list_learner_sessions(principal)
 
-        list_sessions.assert_awaited_once_with(principal)
+        list_recent_sessions.assert_awaited_once_with(principal)
         list_session_archives.assert_awaited_once_with(
             [sess.session_id for sess in owned_sessions],
             principal,
@@ -263,7 +316,7 @@ class LearnerDashboardTest(unittest.IsolatedAsyncioTestCase):
         with (
             patch.object(
                 sessions.session_persistence,
-                "list_sessions",
+                "list_recent_sessions",
                 AsyncMock(return_value=(owned_sessions, True)),
             ),
             patch.object(