scripts/demo-write-check.ps1 types each demo program into the Vim clone
on x64sc (fresh copy of vim/work.d81), confirms the saved SEQ file matches
its ASCII mirror, then runs demo/n8check.s on x128: a DEMO driver (not
N128C) that asks for a file name and runs the current front end (source
reader, lexer, names, parser) with on-screen diagnostics and NAME.ERR.
good.n8 checks clean; bad.n8 reports its four intended errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>