migration: audit uncertain code and prepare handoff

app/tests/test_preservation_slice_market.py

@@ -14,9 +14,8 @@ from backend.data.providers import ifind_client as canonical_ifind
 from backend.data.providers import tushare_client as canonical_tushare
 from backend.features.market import charts
 from tests.preservation_helpers import (
-    ORIGINAL_STATIC,
+    assert_frontend_runtime_matches_audited_baseline,
     assert_moved_asset_matches,
-    reassembled_frontend_runtime,
 )
 
 
@@ -152,10 +151,7 @@ class MarketSliceSourceEquivalenceTests(unittest.TestCase):
         )
 
     def test_relocated_frontend_preserves_original_market_runtime_and_styles(self) -> None:
-        self.assertEqual(
-            reassembled_frontend_runtime(),
-            (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8"),
-        )
+        assert_frontend_runtime_matches_audited_baseline(self)
         for original, migrated in (
             ("styles.css", "styles/styles.css"),
             ("renovation.css", "styles/renovation.css"),