chore(security): enhance environment configuration, CI workflows, and wallet daemon with security improvements

- Restructure .env.example with security-focused documentation, service-specific environment file references, and AWS Secrets Manager integration
- Update CLI tests workflow to single Python 3.13 version, add pytest-mock dependency, and consolidate test execution with coverage
- Add comprehensive security validation to package publishing workflow with manual approval gates, secret scanning, and release

tests/cli/test_marketplace.py

@@ -15,4 +15,56 @@ def runner():
 
 @pytest.fixture
 def mock_config():
-    """Mock configu
+    """Mock configuration for testing"""
+    return {
+        'coordinator_url': 'http://localhost:8000',
+        'api_key': 'test-key',
+        'wallet_name': 'test-wallet'
+    }
+
+
+class TestMarketplaceCommands:
+    """Test suite for marketplace commands"""
+    
+    def test_marketplace_help(self, runner):
+        """Test marketplace help command"""
+        result = runner.invoke(cli, ['marketplace', '--help'])
+        assert result.exit_code == 0
+        assert 'marketplace' in result.output.lower()
+    
+    def test_marketplace_list(self, runner, mock_config):
+        """Test marketplace listing command"""
+        with patch('aitbc_cli.config.get_config') as mock_get_config:
+            mock_get_config.return_value = mock_config
+            with patch('httpx.Client.get') as mock_get:
+                mock_response = Mock()
+                mock_response.status_code = 200
+                mock_response.json.return_value = {
+                    'offers': [
+                        {'id': 1, 'price': 0.1, 'gpu_type': 'RTX 3080'},
+                        {'id': 2, 'price': 0.15, 'gpu_type': 'RTX 3090'}
+                    ]
+                }
+                mock_get.return_value = mock_response
+                
+                result = runner.invoke(cli, ['marketplace', 'offers', 'list'])
+                assert result.exit_code == 0
+                assert 'offers' in result.output.lower() or 'gpu' in result.output.lower()
+    
+    def test_marketplace_gpu_pricing(self, runner, mock_config):
+        """Test marketplace GPU pricing command"""
+        with patch('aitbc_cli.config.get_config') as mock_get_config:
+            mock_get_config.return_value = mock_config
+            with patch('httpx.Client.get') as mock_get:
+                mock_response = Mock()
+                mock_response.status_code = 200
+                mock_response.json.return_value = {
+                    'gpu_model': 'RTX 3080',
+                    'avg_price': 0.12,
+                    'price_range': {'min': 0.08, 'max': 0.15}
+                }
+                mock_get.return_value = mock_response
+                
+                result = runner.invoke(cli, ['marketplace', 'pricing', 'RTX 3080'])
+                assert result.exit_code == 0
+                assert 'price' in result.output.lower() or 'rtx' in result.output.lower()