Anyone know what exactly happened to the shardstorm ZScript wiki?

Another option is to maybe use Doxygen or Natural Docs to pull out a reference to the built-in ZScript functons, as well as the std headers. IIRC around 2014 I created Natural Docs html for the ZScript API, but the format has been altered significantly.

There are reference text files in "zc/resources/docs/..", which may be the best we have now?