feat(mma): Implement run_tier4_analysis in ai_client.py

tests/test_tier4_interceptor.py

@@ -100,3 +100,29 @@ def test_run_powershell_optional_qa_callback():
         
         assert "STDERR:\nerror" in output
         assert "EXIT CODE: 1" in output
+
+def test_end_to_end_tier4_integration():
+    """
+    Verifies that shell_runner.run_powershell correctly uses ai_client.run_tier4_analysis.
+    """
+    import ai_client
+    
+    script = "Invoke-Item non_existent_file"
+    base_dir = "."
+    stderr_content = "Invoke-Item : Cannot find path 'C:\\non_existent_file' because it does not exist."
+    
+    mock_result = MagicMock()
+    mock_result.stdout = ""
+    mock_result.stderr = stderr_content
+    mock_result.returncode = 1
+    
+    expected_analysis = "Path does not exist. Verify the file path and ensure the file is present before invoking."
+    
+    with patch("subprocess.run", return_value=mock_result), \
+         patch("shutil.which", return_value="powershell.exe"), \
+         patch("ai_client.run_tier4_analysis", return_value=expected_analysis) as mock_analysis:
+        
+        output = run_powershell(script, base_dir, qa_callback=ai_client.run_tier4_analysis)
+        
+        mock_analysis.assert_called_once_with(stderr_content)
+        assert f"QA ANALYSIS:\n{expected_analysis}" in output