Expand description
Rust-original types for the bash-style complete builtin extension.
These types back the complete / compopt / compgen builtins
that src/extensions/ext_builtins.rs exposes. They are NOT ports
of any zsh C source — zsh’s native compdef / compctl / compsys
uses completely different types (Cmatch at comp_h.rs:334,
Cmgroup at comp_h.rs:269, Compctl at compctl_h.rs:198).
Previous home was src/ported/zle/computil.rs which violated the
“no Rust-only types in ported files” invariant; moved here so the
ported zle/ tree stays a faithful C-source mirror.