Decision (owner, 2026-06-22): attendee editing is record-only on any writable calendar. Calendula has no INTERNET and never sends an invitation itself — it only writes Attendees rows. Notification is decided downstream (local: no one; CalDAV: server iMIP; Google: Google). Mandatory backend-aware copy makes this honest. No fabricated ORGANIZER; the optional "send .ics via email app" delegate is deferred. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>