fix(projekt-matching): nice-heading exception in extract prompt; lock enable_thinking in tests

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

projekt-matching/tests/test_llm.py

@@ -25,6 +25,7 @@ def test_chat_json_strips_think_and_parses():
     assert out == {"a": 1}
     body = p.call_args.kwargs["json"]
     assert "max_tokens" not in body
+    assert body["chat_template_kwargs"] == {"enable_thinking": False}
     assert body["response_format"]["json_schema"]["schema"] == {"type": "object"}