A pane on a remote server reads fine and never connects its socket. Captured what has been
ruled out by direct test — the server accepts that exact key over wss with and without a
browser Origin, on the first try — so the next session does not re-derive any of it.
The remaining question is client-side lifecycle with several sockets mounted at once, and the
first move is instrumentation rather than theory: the console says a close arrived during
CONNECTING and does not say who called it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
