feat: improve mode and peripheral orchestration

tests/unit/test_self_extension_nfc_sync_contract.py

@@ -37,11 +37,29 @@ def test_peripheral_catalog_sync_is_serialized_and_tracks_backend_revision() ->
     )
 
     assert "peripheralCatalogSyncQueue" in sync
+    assert "const nextCatalog = peripheralCatalog();" in sync
     assert "catalog_revision: peripheralCatalogRevision" in sync
     assert "result.catalog_revision" in sync
+    assert "applyDurablePeripheralCatalog(" in sync
     assert "if (throwOnError) throw error;" in sync
 
 
+def test_backend_catalog_is_authoritative_for_persistent_device_cards() -> None:
+    source = SOURCE_PATH.read_text(encoding="utf-8")
+    hydrate = _function_source(
+        source,
+        "  async function hydratePeripheralCatalog() {",
+        "\n  function vehicleCatalog",
+    )
+    bootstrap = source[source.index("    void hydratePeripheralCatalog()") :]
+
+    assert "applyDurablePeripheralCatalog(" in hydrate
+    assert "if (!catalog.length)" in hydrate
+    assert "renderAll();" in hydrate
+    assert ".finally(() => syncPeripheralCatalog())" not in bootstrap
+    assert "return syncPeripheralCatalog();" in bootstrap
+
+
 def test_bound_card_can_be_reassigned_to_a_new_device() -> None:
     source = SOURCE_PATH.read_text(encoding="utf-8")
     render = _function_source(