- Add calendarFeed collection with secret slug credential
- Add iCal feed endpoint at /campanha/agenda/ical/[secret] (unauthenticated)
- Add server actions for creating and revoking calendar feeds
- Add CalendarFeedButton UI component in agenda filters bar
- Add unit tests for iCal generation
- Fail-closed access: feed re-evaluates creator's municipality scope on each read
- Leader lockdown preserved; no PII in feed output
25773d0296