Add a 'New message' + on the Direct messages section that opens a people picker
(NewConversation): pick one person -> DM, two or more -> group with an optional
name, via the adapter's existing openThread({participantIds, membership, subject}).
Expose directory() on MessagingAdapter (org people list); MockAdapter implements
it + dedupes 1:1 DMs. 72 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds a third membership beyond dm/group: a discoverable, joinable room.
- contract: Membership += 'channel'; Conversation.topic; ChannelSummary +
CreateChannelInput; optional adapter methods browseChannels/createChannel/
joinChannel/leaveChannel (capability-degrading — absent hides the UI)
- MockAdapter implements them (seeds a joined public, a joinable public, and a
private channel); listConversations now returns only threads I'm in
- useChannels hook (browse/create/join/leave + supported flag)
- UI: sidebar sections (Channels vs Direct messages), a + that opens a
ChannelBrowser (join + create), # / lock glyphs; themeable styles
- KernelClientAdapter passes channel membership + topic through
- 4 channel tests (mock browse/join/create + render browse→join); 52 total green
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>