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diff --git a/tests/test-ai-vterm--single-window-toggle.el b/tests/test-ai-vterm--single-window-toggle.el
deleted file mode 100644
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--- a/tests/test-ai-vterm--single-window-toggle.el
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@@ -1,186 +0,0 @@
-;;; test-ai-vterm--single-window-toggle.el --- F9 toggle round-trip when agent is the only window -*- lexical-binding: t; -*-
-
-;;; Commentary:
-;; Regression coverage for the bug where toggling off a single-window
-;; agent (bury) then toggling on again redisplays the agent in a side
-;; split instead of restoring the full-frame layout.
-;;
-;; The fix introduces a `cj/--ai-vterm-last-was-bury' flag set at
-;; toggle-off when `one-window-p' was true.  At toggle-on the display
-;; action consumes the flag and, if the frame is still single-window,
-;; replaces the current window's buffer in place rather than calling
-;; `display-buffer-in-direction'.
-
-;;; Code:
-
-(require 'ert)
-(require 'cl-lib)
-
-(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
-(add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
-(require 'ai-vterm)
-(require 'testutil-vterm-buffers)
-
-;;; Normal Cases
-
-(ert-deftest test-ai-vterm--single-window-toggle-normal-roundtrip-preserves-fullscreen ()
-  "Normal: agent in the only window, F9 (off), F9 (on) -> still single window with agent.
-
-Reproduces Craig's report.  Before the original fix the toggle-on path
-fell through to `display-buffer-in-direction', which split the lone
-window into two and left the agent in a side panel.  Before the
-follow-up fix the toggle-off path could no-op entirely when
-`bury-buffer' couldn't find a buffer to switch to, so the user saw
-\"F9 does nothing\".  The dispatcher now forces the swap to a non-
-agent buffer after bury so the toggle-off is observable in real and
-batch use both."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [single-window-roundtrip]")
-        (cj/--ai-vterm-last-was-bury nil)
-        (cj/--ai-vterm-last-direction nil)
-        (cj/--ai-vterm-last-size nil))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let ((agent-buf (get-buffer-create agent-name)))
-            (set-window-buffer (selected-window) agent-buf)
-            (should (one-window-p))
-            (let ((display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              ;; Toggle off -- the dispatcher's force-swap should put the
-              ;; window on a non-agent buffer.
-              (cj/test--call-as-gui #'cj/ai-vterm)
-              (should (one-window-p))
-              (should-not (cj/--ai-vterm-displayed-agent-window))
-              (should (eq cj/--ai-vterm-last-was-bury t))
-              ;; Toggle on -- should restore agent in the same lone window.
-              (cj/test--call-as-gui #'cj/ai-vterm)
-              (should (one-window-p))
-              (let ((win (cj/--ai-vterm-displayed-agent-window)))
-                (should (windowp win))
-                (should (eq (window-buffer win) agent-buf)))
-              ;; Flag consumed by the display-saved action.
-              (should-not cj/--ai-vterm-last-was-bury))))
-      (cj/test--kill-agent-buffers))))
-
-(ert-deftest test-ai-vterm--single-window-toggle-off-swaps-window-buffer ()
-  "Normal: toggle-off in single-window state forces the window onto a non-
-agent buffer when `bury-buffer' itself didn't swap.
-
-Catches the regression Craig reported after the original fix shipped:
-F9 in a lone-window agent did nothing visible.  The fix layer here
-ensures the displayed buffer changes -- so the next F9 sees an empty
-agent-window state and can route through the display-saved path."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [bury-swap-observable]")
-        (cj/--ai-vterm-last-was-bury nil))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let* ((agent-buf (get-buffer-create agent-name))
-                 (win (selected-window)))
-            (set-window-buffer win agent-buf)
-            (let ((display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              (cj/test--call-as-gui #'cj/ai-vterm))
-            (should (window-live-p win))
-            (should-not (cj/--ai-vterm-buffer-p (window-buffer win)))))
-      (cj/test--kill-agent-buffers))))
-
-(ert-deftest test-ai-vterm--single-window-toggle-normal-flag-set-on-bury ()
-  "Normal: single-window toggle-off sets the bury flag."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [bury-flag-set]")
-        (cj/--ai-vterm-last-was-bury nil))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let ((agent-buf (get-buffer-create agent-name)))
-            (set-window-buffer (selected-window) agent-buf)
-            (let ((display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              (cj/test--call-as-gui #'cj/ai-vterm)
-              (should (eq cj/--ai-vterm-last-was-bury t)))))
-      (cj/test--kill-agent-buffers))))
-
-(ert-deftest test-ai-vterm--single-window-toggle-normal-flag-cleared-on-multi-window-off ()
-  "Normal: multi-window toggle-off clears the bury flag.
-Mirrors the existing `delete-window' branch of the dispatcher --
-the flag should not carry over a prior bury into a delete-window
-toggle-off."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [bury-flag-clear]")
-        (left-name "*test-sw-left*")
-        (cj/--ai-vterm-last-was-bury t))    ; stale t from prior bury
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let ((agent-buf (get-buffer-create agent-name))
-                (left-buf (get-buffer-create left-name)))
-            (set-window-buffer (selected-window) left-buf)
-            (let* ((agent-win (split-window (selected-window) nil 'right))
-                   (display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              (set-window-buffer agent-win agent-buf)
-              (select-window agent-win)
-              (cj/test--call-as-gui #'cj/ai-vterm)
-              (should-not cj/--ai-vterm-last-was-bury))))
-      (when (get-buffer left-name) (kill-buffer left-name))
-      (cj/test--kill-agent-buffers))))
-
-;;; Boundary Cases
-
-(ert-deftest test-ai-vterm--single-window-toggle-boundary-flag-respected-only-when-still-one-window ()
-  "Boundary: if the frame got split between toggle-off and toggle-on, the
-saved-direction split applies as usual.  The flag is a fast-path for the
-genuine single-window case, not an override for every redisplay."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [flag-fallback]")
-        (cj/--ai-vterm-last-was-bury t)        ; flag pretends prior bury
-        (cj/--ai-vterm-last-direction 'right)
-        (cj/--ai-vterm-last-size 40))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let* ((other-buf (get-buffer-create "*test-sw-other*"))
-                 (agent-buf (get-buffer-create agent-name)))
-            (set-window-buffer (selected-window) other-buf)
-            ;; Frame is split (two windows) -- single-window precondition
-            ;; for the flag no longer holds.
-            (split-window-right)
-            (should-not (one-window-p))
-            (let (received-buf
-                  (display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              (cl-letf (((symbol-function 'display-buffer-in-direction)
-                         (lambda (b _a)
-                           (setq received-buf b)
-                           (selected-window))))
-                (cj/--ai-vterm-display-saved agent-buf nil))
-              ;; The saved-direction split path ran (display-buffer-in-direction
-              ;; was called) rather than the in-place fast path.
-              (should (eq received-buf agent-buf))
-              ;; And the flag is cleared either way.
-              (should-not cj/--ai-vterm-last-was-bury))))
-      (when (get-buffer "*test-sw-other*") (kill-buffer "*test-sw-other*"))
-      (cj/test--kill-agent-buffers))))
-
-(ert-deftest test-ai-vterm--single-window-toggle-boundary-flag-not-set-when-bury-not-used ()
-  "Boundary: a fresh dispatcher run with the agent displayed multi-window leaves
-the flag nil (no spurious set)."
-  (cj/test--kill-agent-buffers)
-  (let ((agent-name "agent [bury-flag-untouched]")
-        (cj/--ai-vterm-last-was-bury nil))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let ((agent-buf (get-buffer-create agent-name))
-                (left-buf (get-buffer-create "*test-sw-untouched-left*")))
-            (set-window-buffer (selected-window) left-buf)
-            (let* ((agent-win (split-window (selected-window) nil 'right))
-                   (display-buffer-alist (cj/--ai-vterm-display-rule-list)))
-              (set-window-buffer agent-win agent-buf)
-              (select-window agent-win)
-              (cj/test--call-as-gui #'cj/ai-vterm)
-              (should-not cj/--ai-vterm-last-was-bury))))
-      (when (get-buffer "*test-sw-untouched-left*")
-        (kill-buffer "*test-sw-untouched-left*"))
-      (cj/test--kill-agent-buffers))))
-
-(provide 'test-ai-vterm--single-window-toggle)
-;;; test-ai-vterm--single-window-toggle.el ends here