fix(ai-vterm): reuse the frame's half instead of splitting a third

F9 split a third window into a frame that was already divided in two, wedging the agent into the middle or a skinny extra column instead of taking the half it should occupy. The display rule only knew how to reuse a window already showing an agent or to split a fresh one. With a plain two-pane layout it fell through to the split and added a window.

I added a display action, cj/--ai-vterm-reuse-edge-window, that reuses the window already forming the target half (the right column on a desktop, the bottom row on a laptop), found by a new cj/window-at-edge helper. It records the displaced buffer with display-buffer-record-window, so toggling off restores that buffer through the native quit-restore-window. The slot's buffer swaps between the agent and whatever it displaced, and no window is created or deleted. The split path still handles a single-window frame or a layout split on the other axis, and the lone fullscreen agent keeps its bury-and-restore-in-place behavior.

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