HMAC-signed stateless tokens let external respondents vote on rChoices
polls or RSVP to rCal events via a single tap — no account required.
Routes mounted at /respond/:token bypass space auth. Typed EventAttendee
schema replaces unknown[] on CalendarEvent.attendees. Invite endpoints
on both modules generate tokens and optionally send email invitations.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
