fix(ai-vterm): make F9 a faithful toggle of the agent split

F9 toggle-off used quit-restore-window to dismiss the agent. With several agents alive sharing one slot, switching among them (C-F9) reuses the window via set-window-buffer, which leaves the window's quit-restore parameter pointing at the first agent shown. Once stale, quit-restore-window falls back to switch-to-prev-buffer and surfaces a different agent instead of removing the window, so F9 appeared to "show another agent" rather than hide the split.

Toggle-off now collapses the split with delete-window, which is independent of the slot's buffer history, so the working buffer reclaims the frame. Geometry is captured first so the next toggle-on re-splits at the same width.

Toggle-on reopens the exact agent that was hidden (new cj/--ai-vterm-last-hidden-buffer), falling back to the most-recent agent only when that buffer has been killed. Hide-then-show is now a faithful round trip, not a jump to whichever agent is most-recent in buffer-list.

Sole-window toggle-off returns to the most-recent non-agent buffer instead of other-buffer, which could land on another agent.

I updated the two reuse-edge-window tests that asserted the old restore-displaced-into-a-kept-slot behavior to match the new always-collapse behavior.

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