Add attendees support to calendar events

[arndjan]

Summary

• Add attendees parameter to calendar_create_event and calendar_edit_event tools
• Each attendee is a dict with email (required) and name (optional)
• Return attendee details (name, email, status, role, type) in all event responses
• Uses the EKAttendee private class via PyObjC for adding attendees to events
• Reading attendees uses the public EKParticipant API

Implementation details

• _add_attendees_to_event() creates EKAttendee instances via initWithName:emailAddress:phoneNumber:url: and adds them with EKEvent.addAttendee:
• _event_to_dict() now extracts attendee info from event.attendees() with email fallback via URL
• Helper methods for participant status/role/type enum-to-string conversion

Limitations

• Adding attendees uses Apple's undocumented EKAttendee class — works on current macOS but could break in future OS updates
• Best suited for CalDAV and Exchange-backed calendars; local-only calendars may not support attendees
• Reading attendees works on all calendar types via the public API

Test plan

• Create event with attendees on a CalDAV calendar
• Edit event to add attendees
• Verify attendees appear in Calendar.app
• Verify attendees are returned in get/list/search event responses
• Test on Exchange-backed calendar

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