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/tests/test_ai_news_router.py

@@ -0,0 +1,36 @@
+import datetime as dt
+from unittest.mock import AsyncMock, patch
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+
+def test_refresh_news_sentiment_weekend_skip():
+    # 2026-05-16 = Saturday
+    client = TestClient(app)
+    resp = client.post(
+        "/api/stock/screener/snapshot/refresh-news-sentiment?asof=2026-05-16"
+    )
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "skipped_weekend"
+
+
+def test_refresh_news_sentiment_weekday_invokes_pipeline():
+    fake_summary = {
+        "asof": "2026-05-13", "updated": 3, "failures": [],
+        "duration_sec": 1.0, "tokens_input": 100, "tokens_output": 20,
+        "top_pos": [], "top_neg": [], "model": "m",
+        "mapping": {"total_articles": 5, "matched_pairs": 8, "hit_tickers": 3},
+    }
+    with patch("app.screener.router._ai_pipeline") as mp, \
+         patch("app.screener.router._ai_telegram") as mt:
+        mp.refresh_daily = AsyncMock(return_value=fake_summary)
+        mt.build_message = lambda **kw: f"TEXT_with_mapping={kw.get('mapping')}"
+        client = TestClient(app)
+        resp = client.post(
+            "/api/stock/screener/snapshot/refresh-news-sentiment?asof=2026-05-13"
+        )
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["mapping"]["hit_tickers"] == 3
+    assert "mapping=" in body["telegram_text"]