Match Vim's real direct and set-form tokenization, reject nonexistent colon
assignments, clarify suffix scanning and trust, extend aliases, and pin the
shebang-edit regression in acceptance.
Define bounded Emacs and Vim modeline parsing, alias normalization,
explicit precedence, one pinned language decision shared by syntax and LSP,
and the acceptance contract for load-time mode detection.
Levi Neuwirth