Adds cfg_json.punch_holes.{left,right,center} to mark pre-perforated badge
clip slots with X overlays. Slots are 5/8in x 1/8in, 1/4in from top,
3/8in from left/right edges. Markers print on the badge so attendees know
where to push out the perforations. Template form exposes checkboxes in
Header & Branding. Documented in MODULE__AE_Events_Badge_Templates.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>