refactor: establish standalone application boundary

tests/test_cleanup_contract.py

@@ -4,6 +4,7 @@ import unittest
 from pathlib import Path
 
 from database import ReviewDatabase
+from tests.frontend_test_helpers import registered_frontend_runtime_scripts
 
 
 APP_ROOT = Path(__file__).resolve().parents[1]
@@ -16,9 +17,9 @@ class CleanupContractTests(unittest.TestCase):
         self.assertFalse((FRONTEND_ROOT / "heaven-loading.js").exists())
 
     def test_only_active_heaven_loading_asset_is_loaded(self) -> None:
-        html = (FRONTEND_ROOT / "index.html").read_text(encoding="utf-8")
-        self.assertIn('src="/pages/heaven/loading-v2.js', html)
-        self.assertNotIn('src="/heaven-loading.js', html)
+        scripts = registered_frontend_runtime_scripts()
+        self.assertTrue(any(path.startswith("/pages/heaven/loading-v2.js") for path in scripts))
+        self.assertFalse(any(path.startswith("/heaven-loading.js") for path in scripts))
 
     def test_audited_definition_only_functions_stay_absent(self) -> None:
         runtime = "\n".join(