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When the agent buffer is the only window in the frame, F9 buries it (correct) but the next F9 redisplayed it as a side split instead of restoring the full-frame layout -- the display-saved path always called `display-buffer-in-direction`, which insists on a split.
New `cj/--ai-vterm-last-was-bury` flag tracks which toggle-off path ran. `cj/ai-vterm` sets it to t in the bury branch (one-window-p) and nil in the delete-window branch. `cj/--ai-vterm-display-saved` checks the flag at toggle-on: if t and the frame is still single-window, it replaces the selected window's buffer in place rather than splitting. Either branch consumes the flag so it never stays stale.
5 tests in test-ai-vterm--single-window-toggle.el cover the flag's set/clear paths, the still-one-window guard, and the end-to-end roundtrip.
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