Thin El wrappers over seed JSON primitives (json_get, json_get_raw,
json_parse, json_stringify, json_set, json_array_len, json_array_get,
json_array_get_string) plus typed extractors (json_get_string/int/float/bool)
and pure-El builders (json_build_object, json_build_array,
json_escape_string) that require no seed call.
Will Anderson