feat(agent-office): stock screener 평일 16:30 KST 자동 잡 + 텔레그램 전송

- StockAgent.on_screener_schedule: snapshot/refresh → screener/run(mode=auto)
  → telegram_payload(MarkdownV2) 발송. skipped_holiday는 무발신,
  실패 시 운영자 HTML 알림.
- service_proxy: refresh_screener_snapshot, run_stock_screener 추가
  (각각 180s timeout, STOCK_LAB_URL 기존 env 재사용).
- telegram.messaging.send_raw: parse_mode 파라미터 추가
  (기본 HTML 유지, MarkdownV2 페이로드 직접 전달용).
- scheduler: cron day_of_week=mon-fri hour=16 minute=30 id=stock_screener
  (Asia/Seoul TZ).
- on_command 'run_screener' 수동 트리거 추가.
- tests: 성공/휴일/스냅샷실패/run실패/이상status 5케이스.

agent-office/app/scheduler.py

@@ -14,6 +14,11 @@ async def _run_stock_schedule():
     if agent:
         await agent.on_schedule()
 
+async def _run_stock_screener():
+    agent = AGENT_REGISTRY.get("stock")
+    if agent:
+        await agent.on_screener_schedule()
+
 async def _run_blog_schedule():
     agent = AGENT_REGISTRY.get("blog")
     if agent:
@@ -41,6 +46,14 @@ async def _poll_pipelines():
 
 def init_scheduler():
     scheduler.add_job(_run_stock_schedule, "cron", hour=7, minute=30, id="stock_news")
+    scheduler.add_job(
+        _run_stock_screener,
+        "cron",
+        day_of_week="mon-fri",
+        hour=16,
+        minute=30,
+        id="stock_screener",
+    )
     scheduler.add_job(_run_blog_schedule, "cron", hour=10, minute=0, id="blog_pipeline")
     scheduler.add_job(_run_lotto_schedule, "cron", day_of_week="mon", hour=9, minute=0, id="lotto_curate")
     scheduler.add_job(_run_youtube_research, "cron", hour=9, minute=0, id="youtube_research")