test(agent): delete the hand-rolled run_all_tests runner

It listed TestAgentLogging, TestCreateAgentsFromYaml and
TestAgentBenchmark, none of which exist, so ruff failed with three F821
errors and the runner would have raised NameError if anyone invoked it.
It also duplicated pytest for a file pytest already collects. Master has
already dropped it.

Author: ayaangazali

tests/structs/test_agent.py

@@ -1466,75 +1466,6 @@ def test_rollback_also_rewinds_memory_md(self, tmp_path):
 # ============================================================================
 
 
-def run_all_tests():
-    """Run all test functions"""
-    print("Starting Merged Agent Test Suite...\n")
-
-    # Test classes to run
-    test_classes = [
-        TestBasicAgent,
-        TestAgentFeatures,
-        TestAgentLogging,
-        TestCreateAgentsFromYaml,
-        TestAgentBenchmark,
-        TestAgentToolUsage,
-        TestLLMArgsAndHandling,
-    ]
-
-    total_tests = 0
-    passed_tests = 0
-    failed_tests = 0
-
-    for test_class in test_classes:
-        print(f"\n{'='*50}")
-        print(f"Running {test_class.__name__}")
-        print(f"{'='*50}")
-
-        # Create test instance
-        test_instance = test_class()
-
-        # Get all test methods
-        test_methods = [
-            method
-            for method in dir(test_instance)
-            if method.startswith("test_")
-        ]
-
-        for test_method in test_methods:
-            total_tests += 1
-            try:
-                # Run the test method
-                getattr(test_instance, test_method)()
-                passed_tests += 1
-                print(f"✓ {test_method}")
-            except Exception as e:
-                failed_tests += 1
-                print(f"✗ {test_method}: {str(e)}")
-
-    # Print summary
-    print(f"\n{'='*50}")
-    print("Test Summary")
-    print(f"{'='*50}")
-    print(f"Total Tests: {total_tests}")
-    print(f"Passed: {passed_tests}")
-    print(f"Failed: {failed_tests}")
-    print(f"Success Rate: {(passed_tests/total_tests)*100:.2f}%")
-
-    return {
-        "total": total_tests,
-        "passed": passed_tests,
-        "failed": failed_tests,
-        "success_rate": (passed_tests / total_tests) * 100,
-    }
-
-
-if __name__ == "__main__":
-    # Run all tests
-    results = run_all_tests()
-
-    print(results)
-
-
 # ============================================================================
 # arun forwarding and error path (#1853 item 3)
 # ============================================================================