feat(stock): portfolio_health (집중도·현금·손익)

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

stock/app/test_holdings_intel.py

@@ -213,3 +213,16 @@ def test_news_issues_flags_negative_sentiment(monkeypatch):
     assert "005930" in issues
     assert issues["005930"][0]["type"] == "news"
     assert issues["005930"][0]["severity"] in ("med", "high")
+
+
+def test_portfolio_health():
+    holdings = [
+        {"ticker": "005930", "quantity": 10, "avg_price": 70000, "current_price": 77000,
+         "is_krx": True},
+        {"ticker": "000660", "quantity": 5, "avg_price": 100000, "current_price": 90000,
+         "is_krx": True},
+    ]
+    h = hi.portfolio_health(holdings, total_cash=1000000)
+    assert h["positions"] == 2
+    assert 0 <= h["max_weight"] <= 1.0
+    assert "total_eval" in h and "total_pnl" in h and "cash_ratio" in h