New /thread skill — manage conversation threads without the guesswork

The skill catalog now includes /thread, a built-in guide to managing your conversation threads. Ask the assistant to close a thread, or to clean up your thread list ("mark everything done except the last few"), and it now knows exactly what to do: a thread's lifecycle lives on its content.status, marking one Done is a single idempotent patch, and bulk housekeeping is one listing plus one patch per thread.

The skill also teaches the assistant what not to touch — the message bookkeeping that the execution engine owns — and how to recognize a genuinely stuck thread and report it instead of fighting it. The practical effect: thread housekeeping requests complete in seconds instead of wandering through schema exploration.