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>
Jean-Luc Makiola
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