dev: fix and refactor commit lint rules
dev: fix and refactor commit lint rules

- Fix rules that weren't working due to faulty logic.
- Revise linter messages for clarity and concision.
- Use conventional commit nomenclature: summary -> subject
- case-fold-search = nil, to ensure case sensitive searches
- Exclude bump type from length checks

hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs