Resume Cthulhu on empty i3 workspaces

docs/testing/xterm-handoff.md

@@ -10,10 +10,20 @@ has been admitted. It releases its command grabs. On return, Caps Lock tracking
 adopts the current XKB lock state before treating Caps Lock as the reader
 modifier again.
 
+On i3, focusing an empty workspace resumes Cthulhu and its shortcuts even
+though no accessible application gains focus. This requires i3's verified
+window-manager identity, no EWMH active client, and keyboard focus on i3's
+support window. Returning to a workspace with focused XTerm suspends Cthulhu
+again. Moving or closing the last window also restores shortcuts when i3
+enters that no-client state. This behavior is independent of workspace
+announcement preferences. Unknown focus on other desktops keeps the existing
+handoff policy.
+
 Focused checks:
 
 ```sh
 go test ./internal/app -run 'Test(XTerm|DelegatedInput)' -count=1
+python3 tests/native_i3.py
 python3 tests/native_x11.py
 ```
 
@@ -36,4 +46,12 @@ reader and physical keyboard handling require live verification.
    Control, or Shift when using the “all keys” interruption setting. Expect
    Cthulhu's current announcement and queued continuation to stop promptly.
    Fenrir must continue receiving terminal keys, with no Cthulhu key echo.
-6. Record the exact keys, focused application, speech and Braille for failures.
+6. With XTerm in workspace 7, switch to empty workspace 8. Expect the normal
+   workspace announcement if enabled. Press Cthulhu+Space; expect Preferences
+   to open and its controls to speak and appear on Braille. Close Preferences,
+   return to workspace 7, and check that Fenrir receives its modifier and
+   navigation keys again, without Cthulhu key echo. Repeat with a floating
+   XTerm, and with i3 workspace announcements disabled. The shortcuts must
+   resume on the empty workspace in each case. Also visit an ordinary editor
+   or file manager and confirm normal Cthulhu focus speech and Braille.
+7. Record the exact keys, focused application, speech and Braille for failures.