feat: harden public OpenAI API contracts

backend/scripts/run_tests.py

@@ -0,0 +1,18 @@
+"""Run the backend suite with all local-runtime prerequisites configured."""
+
+from __future__ import annotations
+
+import os
+import unittest
+
+
+def main() -> None:
+    # Must be set before test discovery imports Pipecat and NLTK.
+    os.environ.setdefault("NLTK_DISABLE_IMPORT_SECURITY", "1")
+    suite = unittest.defaultTestLoader.discover("tests")
+    result = unittest.TextTestRunner(verbosity=1).run(suite)
+    raise SystemExit(0 if result.wasSuccessful() else 1)
+
+
+if __name__ == "__main__":
+    main()