Raise InvalidResponseBodyError for every unparsable response body #1094

InvalidResponseBodyError is raised only by KeyValueStoreClient.get_record() (_resource_clients/key_value_store.py:62). Every other method parses the body with response.json() through response_to_dict() / response_to_list() (_utils/http.py:83), so a malformed body surfaces as a bare json.JSONDecodeError or ValueError.

The JS client raises InvalidResponseBodyError for any response body it can't parse.

Expected behavior

Every method raises InvalidResponseBodyError for an unparsable body. Callers that catch ValueError today would miss it, unless the new error also subclasses ValueError.

✍️ Drafted by Claude Code