GET /meetings/list and GET /meetings/{domain}/{id} no longer return 403 invalid-op when the caller's team has the `meetings` feature disabled. The read endpoints now treat a disabled feature as "no meetings": GET /meetings/list returns 200 [], and GET /meetings/{domain}/{id} returns 404 meeting-not-found. Write operations (create, update, delete, invitation mutations) still return 403 invalid-op when the feature is disabled. Previously these read endpoints returned an undocumented 403 invalid-op for members of teams with the meetings feature disabled.
