feat(agent-office): InstaAgent 자율 발급 경로 + 커버 프리뷰

- on_schedule에 autonomous_issue 분기 추가 (eligible 픽만 선별·max_per_day 제한)
- _generate_and_preview 메서드: 슬레이트 생성 → 커버 PNG → 인라인 승인 버튼
- messaging.send_photo 신규 추가 (multipart/form-data, reply_markup 지원)
- insta_get_preferences 실패를 warning으로 격리해 자율 경로 중단 방지

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agent-office/app/agents/insta.py

@@ -71,14 +71,31 @@ class InstaAgent(BaseAgent):
         config = get_agent_config(self.agent_id) or {}
         custom = config.get("custom_config", {}) or {}
         auto_select = bool(custom.get("auto_select", False))
+        autonomous = bool(custom.get("autonomous_issue", False))
+        threshold = float(custom.get("select_threshold", 0.6))
+        max_per_day = int(custom.get("max_per_day", 2))
 
         task_id = create_task(self.agent_id, "insta_daily", {"auto_select": auto_select},
                               requires_approval=False)
         await self.transition("working", "뉴스 수집·키워드 추출", task_id)
         try:
-            prefs = await service_proxy.insta_get_preferences()
-            add_log(self.agent_id, f"insta preferences: {prefs}", "info", task_id)
+            try:
+                prefs = await service_proxy.insta_get_preferences()
+                add_log(self.agent_id, f"insta preferences: {prefs}", "info", task_id)
+            except Exception as _pref_err:
+                add_log(self.agent_id, f"insta preferences unavailable: {_pref_err}", "warning", task_id)
             await self._run_collect_and_extract()
+            if autonomous:
+                ranked = await service_proxy.insta_ranked(threshold=threshold, limit=20)
+                eligible = [r for r in ranked if r.get("eligible")][:max_per_day]
+                if not eligible:
+                    await messaging.send_raw("📰 [인스타 큐레이터] 오늘은 발행할 가치 있는 주제가 없습니다.")
+                else:
+                    for pick in eligible:
+                        await self._generate_and_preview(pick)
+                update_task_status(task_id, "succeeded", {"issued": len(eligible)})
+                await self.transition("idle", "자율 발급 후보 프리뷰 완료")
+                return
             kws = await service_proxy.insta_list_keywords(used=False)
             if auto_select:
                 await self._auto_render(kws)
@@ -161,6 +178,27 @@ class InstaAgent(BaseAgent):
         full_caption = f"{caption}\n\n{hashtags}".strip()
         await _send_media_group(media, caption=full_caption)
 
+    async def _generate_and_preview(self, pick: dict) -> None:
+        """eligible 픽 → 슬레이트 생성·렌더 → 커버 프리뷰 + 승인 버튼."""
+        created = await service_proxy.insta_create_slate(
+            keyword=pick["keyword"], category=pick["category"], keyword_id=pick["id"],
+        )
+        st = await self._wait_task(created["task_id"], step="slate", timeout_sec=600)
+        slate_id = st["result_id"]
+        cover = await service_proxy.insta_get_asset_bytes(slate_id, 1)
+        bd = pick.get("breakdown", {})
+        caption = (f"🎴 <b>{pick['keyword']}</b> ({pick['category']})\n"
+                   f"점수 {pick.get('final_score')} · fresh {bd.get('freshness')} "
+                   f"fit {bd.get('account_fit')} claude {bd.get('claude')}\n승인하시겠어요?")
+        kb = {"inline_keyboard": [[
+            {"text": "✅ 승인", "callback_data": f"issue_approve_{slate_id}"},
+            {"text": "❌ 반려", "callback_data": f"issue_reject_{slate_id}"},
+            {"text": "🔄 재생성", "callback_data": f"issue_regen_{slate_id}"},
+        ]]}
+        await messaging.send_photo(cover, caption=caption, reply_markup=kb)
+        create_task(self.agent_id, "insta_issue", {"slate_id": slate_id, "keyword_id": pick["id"]},
+                    requires_approval=True)
+
     async def on_command(self, command: str, params: dict) -> dict:
         if command == "extract":
             await self._run_collect_and_extract()