Explicitly close a sncro session — "Finished With Engines".
Call this when you are done debugging and will not need the sncro tools
again in this conversation. After this returns, all sncro tool calls on
this key will refuse with a SESSION_CLOSED message — that is your signal
to stop trying to use them and not apologise about it.
Use it when:
- The original problem is solved and the conversation has moved on
- The user explicitly says "we're done with sncro for now"
- You're entering a long stretch of work that won't need browser visibility
The session can't be reopened. If you need browser visibility later, ask
the user whether to start a new one with create_session.
Connector