After `x` stops a dashboard-owned bottle, slide focus to the
next agent in the agents pane (the one filling the stopped
row, or the new last row if the stopped was last) and respawn
the right pane with that agent's claude session via `--continue`.
If no agents remain, close the right pane via `tmux kill-pane`.
Two new helpers:
- `_tmux_close_right_pane(tmux_state)` — kills the tracked
pane (if it exists) and clears pane_id / slug.
- `_pick_next_after_stop(agents_before, selected_index,
stopped_slug)` — pure chooser returning (new_index, agent)
or None. Tested directly.
Outside tmux, only the selected_agent index slides; no
auto-attach (foreground handoff would take over the terminal,
disruptive). 485 unit tests pass (6 new for the pick helper).
didericis
8d6e382af5