What is our preferred linting and formatting configuration for ruby?

[jaredlt]

A follow up to #1307

We don't want to bikeshed on this stuff. Let the linter do it for us! Options:

• Rails comes with it's own Rubocop configuration which we currently default to
• Standard has been the defacto go-to at thoughtbot for a long time
• Rubocop with our own / custom cops

I think this is relevant to bring up again as we're looking at enforcing certain rules via linting as opposed to AI rules

[jaredlt]

Personally, I love the no configuration approach to Standard. It matches our ethos (we shouldn't be bike shedding this stuff - one set of rules, they're all followed).

I want to make a distinction that I love Standard to define overall code style. But that doesn't mean we should not be able to lint other things that we believe will help us avoid bad practices.

My vote is for Standard as a base. Then we layer on additional rules that we are "moving left" to allow us and AI agents to enforce via linting, as opposed to unreliable lines in a CLAUDE.md.

Standard can be set up to support this in a couple of ways

• Standard with plugins and configurations extensions - this approach means we remove RuboCop and install Standard directly, which brings in Rubocop itself)
• Running Standard's rules via RuboCop - technicall, Standard so this is not officially supported but they have a full section in the README for how to do it, plus Evil Martians keep an updated guide on the approach

I suspect running Standard's rules via RuboCop might be better for us as I'm assuming it will be easier to take advantage of the full RuboCop ecosystem.