news: get_news degrades softly on topic miss (news-13) — any-term ranked fallback, recent+note, language hint in schema; idle-impulse default varies form

tests/test_spec_news.py

@@ -303,6 +303,26 @@ class TestQueryNews(NewsStoreBase):
         self.assertGreaterEqual(len(query_news(self.store, limit=0)["results"]), 1)
         self.assertIn("error", query_news(None))
 
+    def test_exact_match_has_no_note(self):
+        """NEWS-13: a direct AND-match returns without a note field."""
+        self.seed()
+        self.assertNotIn("note", query_news(self.store, topic="storm"))
+
+    def test_partial_match_falls_back_ranked(self):
+        """NEWS-13: AND-miss -> any-term match, most keyword hits first, with a note."""
+        self.seed()
+        res = query_news(self.store, topic="Nordland road accident")
+        self.assertEqual(res["results"][0]["title"], "Nordland storm")
+        self.assertIn("note", res)
+
+    def test_no_match_falls_back_to_recent(self):
+        """NEWS-13: nothing matches any term -> newest items + note, never empty-handed."""
+        self.seed()
+        res = query_news(self.store, topic="quantum blockchain")
+        self.assertTrue(res["results"])
+        self.assertEqual(res["results"][0]["title"], "Sport result")  # newest first
+        self.assertIn("note", res)
+
 
 class TestNewsTool(unittest.IsolatedAsyncioTestCase):
     def setUp(self):