parse() turns a script into pipeline command segments via bashlex,
keeping byte-true char offsets for every word (quotes included as
typed, redirects and env assignments excluded from words), and
splice() rebuilds a corrected script from (start, end, text)
replacements applied right-to-left. When bashlex is missing or
rejects the script, a flat split(' ') segment keeps the old view.
Alexander
a5c675cdea