test(serve): rebase #1900 test onto #1918 _score_query API; bench newline

PR #1918 replaced _pick_seeds(terms=) with best_seed_by_term= from
_score_query. Update the #1900 German-stopword seed test to the new
single-traversal API and add the missing trailing newline in the
(manual, non-collected) query-scoring benchmark.

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

tests/bench_query_scoring.py

@@ -277,4 +277,4 @@ def main(argv: list[str] | None = None) -> int:
 
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main())

tests/test_serve.py

@@ -393,7 +393,11 @@ def test_pick_seeds_german_query_seeds_content_node_not_heading_noise():
 
     q = "Wie funktioniert die Authentifizierung?"
     terms = _query_terms(q)
-    seeds = _pick_seeds(_score_nodes(G, terms), G=G, terms=terms)
+    # #1918: _score_query does combined scoring + per-term singleton winners in
+    # one traversal; _pick_seeds consumes best_seed_by_term for the per-term
+    # guarantee (replaces the old terms= per-term rescoring).
+    qs = _score_query(G, terms, collect_per_term_seeds=True)
+    seeds = _pick_seeds(qs.ranked, G=G, best_seed_by_term=qs.best_seed_by_term)
     assert "auth" in seeds
     assert "cfg" not in seeds
     assert "sec" not in seeds