fix(config_flow): F2 — MAC-less zeroconf discovery calls the audited _async_handle_discovery_without_unique_id helper and guards against a same-host duplicate prefill, so re-discovery can't stack entries; the import guard reads entries via the base _async_current_entries helper; TestMacLessDiscoveryF2 pins helper call + one-entry outcome (t32)

tests/entity_stublib.py

@@ -144,6 +144,10 @@ def install() -> None:
         async_set_unique_id = _stub_set_unique_id
         _abort_if_unique_id_configured = _noop_abort
 
+        def _async_handle_discovery_without_unique_id(self):
+            # t32 F2 (audited helper): recording no-op at hub scope
+            pass
+
         def async_show_form(self, *, step_id, data_schema=None, errors=None):
             return {
                 "type": "form",