Archive a session
Archives the session. This is an archive, not a destroy: the transcript is durable product state and remains fully queryable through the records surface and exportable. An archived session accepts no new work; branch it to continue from any entry. It is ONE WAY, and there is no operation here that undoes it: once a session is archived, nothing can move it back to accepting work. What continues from it is a branch, which is a new session with a new id — so every reference to the archived id (a link, a script, a teammate’s note) keeps pointing at a conversation that will never run again. A client that offers this to a person should ask them first. A session with a turn in flight is refused (409) rather than archived: that turn would finish into a session no write can move afterwards.
Path Parameters
The session's id.
Response
Archived. The transcript remains in the record.

