refactor: rename stock-lab → stock (graduation)

- git mv stock-lab/ → stock/
- docker-compose.yml: 서비스 키 + container_name + build.context +
  frontend.depends_on + agent-office STOCK_LAB_URL → STOCK_URL
- agent-office/app: config.py, service_proxy.py, agents/stock.py, tests/
  STOCK_LAB_URL → STOCK_URL
- nginx/default.conf: proxy_pass http://stock-lab → http://stock (3 lines)
- CLAUDE.md / README.md / STATUS.md / scripts/ 문구 갱신
- stock/ 내부 자기 참조 갱신

lab 네이밍 정책 (feedback_lab_naming.md) graduation.
API URL / Python import / DB 파일명 변경 없음.

stock/app/test_screener_nodes_rs_rating.py

@@ -0,0 +1,25 @@
+import datetime as dt
+import pandas as pd
+
+from app.screener.engine import ScreenContext
+from app.screener.nodes.rs_rating import RsRating
+from app.screener._test_fixtures import make_master, make_prices, make_flow, make_kospi
+
+
+def _ctx(master, prices, flow, kospi):
+    return ScreenContext(master=master, prices=prices, flow=flow,
+                         kospi=kospi, asof=dt.date(2026, 5, 12))
+
+
+def test_outperformer_gets_higher_score():
+    asof = dt.date(2026, 5, 12)
+    master = make_master(["UP", "DN"])
+    up = make_prices(["UP"], days=260, asof=asof, trend_pct=0.3)
+    dn = make_prices(["DN"], days=260, asof=asof, trend_pct=-0.1)
+    prices = pd.concat([up, dn], ignore_index=True)
+    flow = make_flow(["UP", "DN"], days=260, asof=asof)
+    kospi = make_kospi(days=260, asof=asof, trend_pct=0.0)
+
+    out = RsRating().compute(_ctx(master, prices, flow, kospi),
+                             RsRating.default_params)
+    assert out["UP"] > out["DN"]