When golem15.chat is active, Boot registers the context alias bm (id 1)
on its registry. Membership is the user group jz.bm.chat.group (default
studenci); CanOverseeChats is always false, so nobody reads other
people's DMs or edits their messages; the broadcast channel is
chat:context:1, never empty.
GET /_bm/api/v1/chat answers the caller's membership behind jwt.auth and
the per-user bucket jz.bm.chat (240 a minute). The chat config block
(group, moderator_group, max_upload_bytes, max_embeds) is added. jz.bm
still Requires only golem15.user; all chat wiring is gated by HasPlugin.
Dashboard, courses with counters, schedule, meetings, deadlines,
readings with per-user progress (mark and unmark) and paginated
published materials with tags and files, behind golem15.user's
jwt.auth. Responses are built field by field with Warsaw RFC 3339
timestamps; bad query parameters answer 422 in Laravel's shape.
