Miguel Palhas
938dd62648
Integration review (#168): a rejected attach handshake — a dormant session's 409 not_attachable, most likely — looks identical to a dropped stream from the WebSocket API (close code 1006, no reason). shouldRetryClose kept retrying it on the catalog's Running/Dead check alone, which loops for as long as the catalog hasn't caught up with the session going dormant. Track whether the socket ever reached `open`; a handshake that never did is a rejection, not a blip, so it is never retried regardless of catalog status. The caller (wired up in the next commit) gets a distinct onNeverAttached callback instead of onClosed, so it can offer the resume affordance rather than assuming the session is gone.