RapidEnumerator primed the walk position at the first pierce point, then
the skipped first rapid advanced it again. Raw programs start with a zero
rapid so this was invisible, but lead-in programs start with a real
incremental offset to the pierce, which shifted every later rapid by that
delta and drew rapids off the sheet. Start the walk at the program origin.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ajandClaude Opus 5.5
c33337cea2