Clojure wrapper for the Google Classroom API (v1).

Provides idiomatic Clojure functions for managing courses, course rosters
(Students, Teachers), course work, announcements, and course aliases.

Auth: use csl/scoped-delegated-credentials or csl/user-credentials with the
appropriate scope:
- ClassroomScopes/CLASSROOM_COURSES                  (read/write courses)
- ClassroomScopes/CLASSROOM_COURSES_READONLY
- ClassroomScopes/CLASSROOM_ROSTERS                  (read/write rosters)
- ClassroomScopes/CLASSROOM_ROSTERS_READONLY
- ClassroomScopes/CLASSROOM_COURSEWORK_STUDENTS      (read/write course work as teacher)
- ClassroomScopes/CLASSROOM_COURSEWORK_ME            (read/write course work as student)
- ClassroomScopes/CLASSROOM_ANNOUNCEMENTS            (read/write announcements)
- ClassroomScopes/CLASSROOM_ANNOUNCEMENTS_READONLY
- ClassroomScopes/CLASSROOM_PROFILE_EMAILS           (read roster profile emails)

All list functions return {:data [...] :next-page-token "..."}.
:next-page-token is absent when there are no further pages.

Update semantics: functions named update-* use PATCH (partial update);
functions named replace-* use PUT (full replacement). The Classroom API
only exposes PUT for Courses — CourseWork and Announcements are PATCH-only,
so no replace-* exists for those resources.

All functions return {:data ...} on success or {:error ...} on failure.