Clojure wrapper for the Google Tasks API (v1).

Provides idiomatic Clojure functions for managing task lists and tasks,
including completion tracking, due-date filtering, and task reordering.

Auth: use csl/scoped-delegated-credentials or csl/user-credentials with
the appropriate scope:
- TasksScopes/TASKS          (full read/write)
- TasksScopes/TASKS_READONLY (read-only)

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). Both return the
updated resource.

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