Mycorrhiza uses Git, but you're free to replace the executable Mycorrhiza uses with a shim that does nothing, such as
/bin/true, or a more complex one that'll hand out errors smartly, like this. Assuming it's in
$HOME/bin, you can run Mycorrhiza with a custom
$ PATH=$HOME/bin:$PATH mycorrhiza path/to/wiki
It'll pick up the shim and use it instead of the original Git binary.