Fix data version extraction

README.md

@@ -60,6 +60,8 @@ pip install -r requirements.txt
 python3 app.py
 ```
 
+Needs `git` on PATH and the clone's `.git` left in place — with no `VERSION` file, that's what the panel falls back to at startup for the same stale-UI check.
+
 ### Add a reverse proxy (optional)
 
 It serves the panel at `/heos` and refuses everything else on that host; the file ends with the two-line change that puts it at the root instead.