List messages

Returns the messages sent to the Session after it was created: follow-ups and mid-turn steers, each followed by a system note saying how it was delivered. It does not contain the opening prompt or the agent's replies, so it is empty for a Session that received no follow-up. For the conversation in order (the opening prompt, the follow-ups and each turn's reply) use listSessionConversation (GET .../conversation). The latest answer is also result on the Session (getSession), and every reply is an assistant event (listSessionEvents). Cursor-paginated: pass the previous response's end_cursor as after (legacy spelling: after_seq / next_seq).

_{Scope: sessions:read}