migration: prove standalone maintenance and correct visual evidence

app/tests/test_frontend_boundaries.py

@@ -4,6 +4,7 @@ import json
 import re
 import unittest
 from pathlib import Path
+from unittest.mock import patch
 
 from tests.preservation_helpers import reassembled_frontend_runtime
 
@@ -46,6 +47,14 @@ class FrontendBoundaryTests(unittest.TestCase):
         self.assertIn("const state = window.XiaobaiState.create({", app)
         self.assertNotIn("const state = {", app)
 
+    def test_candidate_runtime_reassembly_does_not_require_original_static(self) -> None:
+        with patch(
+            "tests.preservation_helpers.ORIGINAL_STATIC",
+            ROOT / "missing-original-static",
+        ):
+            app = reassembled_frontend_runtime()
+        self.assertIn("function openView(", app)
+
     def test_runtime_page_registry_matches_governance_registry(self) -> None:
         expected = json.loads(
             (ROOT / "config" / "pages.config.json").read_text(encoding="utf-8")