dwt: record that the owner moved windows on the real unit (extra windows are not a bug)

dwt/notes/OWNER_ACTIVITY.md

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+# Owner activity during the real-unit session
+
+## Windows moved on the real VT1200
+
+The owner moved windows around on the real terminal while the X11 text-app
+worker was running. Several windows are therefore visible on screen at once.
+
+Any screenshot showing multiple windows is the **owner's window arrangement**,
+not a duplicate instance of the app under test and not a rendering bug.
+Identify the app under test by its title, content or stage markers rather than
+by counting windows.