Clean frontend app entrypoint

backend/tests/test_sprint39_frontend_orchestration_hooks.py

@@ -27,6 +27,17 @@ def test_app_uses_shared_orchestration_hooks() -> None:
     assert "externalApi" not in app
 
 
+def test_app_entrypoint_has_clean_encoding_and_react_imports() -> None:
+    app_path = ROOT / "frontend" / "src" / "App.tsx"
+    app_bytes = app_path.read_bytes()
+    app = app_path.read_text(encoding="utf-8")
+
+    assert not app_bytes.startswith(b"\xef\xbb\xbf")
+    assert "import { useEffect, useMemo } from 'react'" in app
+    assert "FormEvent" not in app
+    assert "useState" not in app
+
+
 def test_demo_workflow_hook_owns_demo_api_and_cross_module_selection() -> None:
     hook = (ROOT / "frontend" / "src" / "hooks" / "useDemoWorkflow.ts").read_text(encoding="utf-8")