Grep tool was sometimes failing for me to find matches.
Instead of understanding and fixing, this just switches to using rg --json, similar to the Ripgrep.search code.
I briefly tried reusing the latter, but it expects a dir and grep tool works fine with a file path, so I chose not to reuse.

There are further improvements to be had here with reusing Ripgrep, or at least the schema. But not this PR.