migration: audit uncertain code and prepare handoff

tests/test_preservation_slice_frontend.py

@@ -7,18 +7,15 @@ from backend.bootstrap.config import APP_DIR, STATIC_DIR
 from tests.preservation_helpers import (
     FRONTEND_ROOT,
     ORIGINAL_STATIC,
+    assert_frontend_runtime_matches_audited_baseline,
     assert_moved_asset_matches,
     assert_page_prefix_matches,
-    reassembled_frontend_runtime,
 )
 
 
 class FrontendPreservationSliceTests(unittest.TestCase):
-    def test_split_runtime_reassembles_to_the_exact_original(self) -> None:
-        self.assertEqual(
-            reassembled_frontend_runtime(),
-            (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8"),
-        )
+    def test_split_runtime_matches_original_except_audited_retirements(self) -> None:
+        assert_frontend_runtime_matches_audited_baseline(self)
 
     def test_index_diff_is_limited_to_asset_relocation_and_split_loading(self) -> None:
         migrated = (FRONTEND_ROOT / "index.html").read_text(encoding="utf-8")
@@ -64,7 +61,6 @@ class FrontendPreservationSliceTests(unittest.TestCase):
         for original, migrated in (
             ("ui-core.js", "shared/ui-core.js"),
             ("heaven-loading-v2.js", "pages/heaven/loading-v2.js"),
-            ("heaven-loading.js", "heaven-loading.js"),
             ("vendor/lucide.min.js", "vendor/lucide.min.js"),
             ("pages.config.js", "pages.config.js"),
             ("pages/runtime.js", "pages/runtime.js"),