migration: audit uncertain code and prepare handoff

app/tests/test_preservation_slice_ladder_rotation.py

@@ -6,10 +6,9 @@ import unittest
 from pathlib import Path
 
 from tests.preservation_helpers import (
-    ORIGINAL_STATIC,
+    assert_frontend_runtime_matches_audited_baseline,
     assert_moved_asset_matches,
     assert_page_prefix_matches,
-    reassembled_frontend_runtime,
 )
 
 
@@ -84,10 +83,7 @@ class LadderRotationSliceSourceEquivalenceTests(unittest.TestCase):
             sha256(APP_ROOT / "config/api.config.json"),
             sha256(ORIGINAL_ROOT / "config/api.config.json"),
         )
-        self.assertEqual(
-            reassembled_frontend_runtime(),
-            (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8"),
-        )
+        assert_frontend_runtime_matches_audited_baseline(self)
         assert_moved_asset_matches(self, "styles.css", "styles/styles.css")
         for page in ("pages/ladder/page.js", "pages/rotation/page.js"):
             assert_page_prefix_matches(self, page)