chore(tech-debt): Finalize gui_2.py cleanup and test suite discipline

tests/test_agent_capabilities.py

@@ -1,3 +1,4 @@
+import pytest
 import sys
 import os
 
@@ -6,4 +7,4 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 
 def test_agent_capabilities_listing() -> None:
- pass
+ pytest.fail("TODO: Implement assertions")