PRD 0021 follow-up. Mirrors the bringup-into-right-pane fix
on the explicit-stop path: when `\$TMUX` is set, the stop
flow respawns the right pane with `tail -F
state/<slug>/teardown.log` (via `_ensure_right_pane` —
reuses the existing right pane if it's the agent's claude
session) and redirects fd 2 to that log for the duration of
`capture_session_state` + `cm.__exit__`. compose-down +
network-remove messages stream into the right pane.
After `settle_state` removes the state dir, the tail keeps
its buffered output visible (tail -F handles file removal
gracefully); the next attach respawns the pane with claude.
Falls back to the existing curses-endwin path on tmux
failure, or when the dashboard isn't in tmux at all.
didericis
933d8cf6c3