fix: resolve missing pytest fixture in test_health_check

test_health_check(client) declared a 'client' parameter expecting
a pytest fixture that was never defined. Every other test in the
suite uses the local get_client() helper instead. The error caused
the entire test run to report an ERROR and the health endpoint was
never actually tested.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: anshul23102

tests/test_basic.py

@@ -280,7 +280,8 @@ def test_download_code_found():
     response = client.get("/project/1/download")
     assert response.status_code == 200
 
-def test_health_check(client):
+def test_health_check():
+    client = get_client()
     response = client.get("/health")
     assert response.status_code == 200
     data = response.get_json()