Hojun-Cho abd97e6c57 lib/getopt: printusage + printhelp ...

Port ref/hare/getopt/getopts.ha:202-314 (printusage / _printusage / containsh /
printhelp): the two-pass io.empty width measurement + the >72-col indent rule.
Table-driven tests. cstage-only (C-first); wwstage byte-id twin owed (#125).
printsubcmds + parse() deferred (#127 / #126).

2026-06-07 06:19:13 +09:00

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