docs: Demo-Screenshot aus echtem Demo-Lauf (docs/media/demo.png)

docs/media/demo.md

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+# Demo screenshot
+
+![patchorder demo output](demo.png)
+
+`demo.png` (1600x900) is the unedited terminal output of a real demo run, rendered to an image on 2026-11-03. All hosts, users, devices and files in it are fictional sample data that ships with this repository. No network service or real system was involved.
+
+Setup: python -m pip install -e ..
+
+Commands, in the order shown in the image:
+
+```text
+$ python -m patchorder demo | head -n 20
+```
+
+Pipes such as `head`, `grep` or `sed` in the commands above only shorten the output so it fits on one screen. They are part of the shown command.