Add safe archive preview and extraction workflows

tests/test_router_contract.py

@@ -49,11 +49,20 @@ class FilesRouterContractTests(unittest.TestCase):
         actual = self._operation_keys(router)
 
         self.assertEqual(expected, actual)
-        self.assertEqual(50, len(actual))
+        self.assertEqual(52, len(actual))
         self.assertFalse(
             [operation for operation, count in Counter(actual).items() if count > 1]
         )
 
+    def test_archive_preview_and_confirmation_routes_are_exposed(self) -> None:
+        routes = {
+            (tuple(sorted(route.methods or ())), route.path)
+            for route in router.routes
+        }
+
+        self.assertIn((("POST",), "/files/archive-preview"), routes)
+        self.assertIn((("POST",), "/files/archive-confirm"), routes)
+
     def test_connector_routes_keep_existing_api_paths(self) -> None:
         routes = {(tuple(sorted(route.methods or ())), route.path) for route in router.routes}