- SessionResponse: use 'id' (int64) not 'session_id'/'client_id'
- StateResponse: match actual server response shape
- GetMembers: strip '#' from channel name for URL path
- These bugs prevented the CLI from working correctly with the server
The poll loop was storing msg.ID (UUID string) as afterID, but the server
expects the integer queue cursor from last_id. This caused the CLI to
re-fetch ALL messages on every poll cycle.
- Change PollMessages to accept int64 afterID and return PollResult with LastID
- Track lastQID (queue cursor) instead of lastMsgID (UUID)
- Parse the wrapped MessagesResponse properly
The bare 'chatd' pattern matched the cmd/chatd/ directory,
preventing main.go from being tracked. Use /chatd to only
match the binary at the repo root.
