Lists invites for identityValue's calendar that are new since sinceCursor. The adapter is
responsible only for fetching + normalizing — the watcher decides attendee-membership,
join-URL resolution, and dedupe. An adapter SHOULD return only upcoming (future-start) invites
where it can, but the watcher defends against past-start invites regardless.
The agent identity's address (an email, for IdentityType='Email').
OptionalsinceCursor: stringThe cursor returned by the previous poll, or undefined on the first poll.
The new invites + the next cursor.
The injectable calendar-API seam — the per-provider calendar backend the CalendarWatcher polls. This is the bridge program's "documented seam, not a hard dependency" pattern (mirroring the bridge SDK seams and
IRealtimeSession): the watcher depends only on this interface, so it is fully unit-testable with an in-memory mock and production binds the real Microsoft Graph / Google Calendar client behind it.An implementation watches one agent identity's calendar (the identity value is passed per call so a single adapter instance can serve many identities on the same provider/credential).
See
GraphCalendarSource / GoogleCalendarSource for the production binding stubs.