feat(ai_news): router forwards mapping stats to telegram

stock-lab/tests/test_ai_news_router.py

@@ -20,17 +20,17 @@ def test_refresh_news_sentiment_weekday_invokes_pipeline():
         "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: "BUILT_TEXT"
+        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["asof"] == "2026-05-13"
-    assert body["updated"] == 3
-    assert body["telegram_text"] == "BUILT_TEXT"
+    assert body["mapping"]["hit_tickers"] == 3
+    assert "mapping=" in body["telegram_text"]