KRB page structures only bundle

Run order:
1. krb-page-structures-only-20260612-150856-preflight.js (read-only)
2. krb-page-structures-only-20260612-150856-live.js (mutating)

Scope:
- Matches 85 already-created KRB pages
- Appends Template / PS - Empty Page Structure to each matched page root
- Unlinks the inserted structure component instance where supported

Safety:
- No page or folder creation
- No SEO title/meta description updates
- No delete calls
- No publish calls
- No CMS creation
- No mapped body/component population beyond the empty page structure wrapper

If the live report shows missing or ambiguous pages, paste the full report back before retrying.
