In the app, a user can swipe/archive a conversation from their own inbox and the rest of the team still has it. Close is org-wide. Done for everyone.
The API only exposes close: true, which is Close for everyone. There is no per-user archive. So an assistant cannot clear my inbox without hiding the thread from teammates on shared/team conversations (Certificates, Accounting, Audits, etc.). We will not Close those unless the work is actually done for the whole shop.
What we need: a PATCH on a conversation that archives it for the token owner only, matching the app swipe. Leave Close as the all-users done action.