Reaching the `isTerminal === false` branch means the superseded-turn guard
above it already passed, so `session.isStreaming` is false: a command
issued from that point mounts immediately while panels queued earlier in
the turn stay in `#pendingCommandOutput` until some later terminal
agent_end. Newer output rendered ahead of older, and the queued panel
could strand for minutes on an async fan-out that keeps settling
non-terminally.
Flush there too. The transcript is quiescent at a settle, which is the
condition #4806 wanted, and the notice now says "until the agent pauses"
rather than promising the current turn.
Mantas Vidutis
ced87b907b