self-study-agent: self-driving loop, no memory format details, auto_repeat config

- Replace static pipeline diagram with self-driving loop (check memory → decide → execute → repeat)
- Remove detailed memory structure JSON schemas from all files
- Remove honcho-specific storage strategy from skill (storage is caller's responsibility)
- Add auto_repeat section to config.yaml (enabled, max_sessions_per_chat, stop_conditions)
- Add rule 8 (auto-repeat) and rule 9 (termination conditions) to execution rules
- Add session transition logic to adaptation.md (due cards → review, incomplete → study)

skills/self-study-agent/config.yaml

@@ -68,6 +68,15 @@ interleaving:
   mix_previous_sessions: 3   # 이전 세션 주제 포함 수
   mix_ratio: 0.3             # 이전 주제 비중
 
+# 자동 반복 설정
+auto_repeat:
+  enabled: true
+  max_sessions_per_chat: 5
+  stop_conditions:
+    - no_due_cards
+    - no_incomplete_topics
+    - max_sessions_reached
+
 # 적응
 adaptation:
   # 정답률 기반 적응