jz.bm.chat.max_upload_bytes is now handed to golem15.chat as the total
size of one message's attachments, so the server enforces the limit the
bootstrap advertises.
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.
