After | Real T3 server + real Cursor provider
Fresh isolated data; trusted TLS inspection proxy; HTTP/2 disabled
Cursor CLI config: {"network":{"useHttp1ForAgent":true}}
$ t3 project add <synthetic workspace> --title Transport
Added synthetic project Transport.
Exit status: 0
$ t3 thread start <synthetic workspace> "Reply with OK only. Do not use tools." --provider cursor --wait --json
{"status": "completed", "reply": "OK", "error": null}
Exit status: 0