In order for this to scale, I need to solve two things:
1. Ad-hoc ignore fill-column rules for URLs and other exceptions.
2. Run Elisp flychecker without evaluating my Elisp code and firing its
side-effects.
After growing frustrated with doom-modeline's compatibility with my EXWM setup,
I decided to borrow @tazjin's setup, which I find to be much more appealing.