Availability-get user availability schedule
Use: Fetch details for one named availability schedule. When: User asks about specific schedule rules or needs rules for a named schedule. Needs: Schedule URI from `availability-list_user_availability_schedules`. Do: Read `rules` array and `timezone` for display or to inform event-type updates. Avoid: Writing to this schedule—use event-type-level update for changes. Then: Report schedule details to user or use rules for availability queries.