App commands and --ha-remove (iteration 2, step 6)

The platform accepts app commands (D43): flags that get a
QCoreApplication like the manifest commands and run prepare() and then
the new hook runCommand(). The app's --ha-remove clears the device's
retained topics, so HA deletes the device; uninstall.sh runs it after
stopping the app and before unregistering from SteamVR.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/package-release.sh

@@ -64,9 +64,14 @@ EOF
 
 cat > "$out/uninstall.sh" <<EOF
 #!/bin/sh
-# Unregisters $name from SteamVR and stops it. The folder can be deleted afterwards.
+# Stops $name, removes its device from Home Assistant (clears its retained MQTT
+# topics) and unregisters it from SteamVR. The folder can be deleted afterwards.
 cd "\$(dirname "\$0")" || exit 1
-pkill -f "/bin/$exe( |\\$)" 2>/dev/null
+mkdir -p logs
+# Stopped first, so it can't publish itself again; the broker sends its last will at once.
+pkill -f "/bin/$exe( |\\$)" 2>/dev/null && sleep 1
+./bin/$exe --ha-remove --log-file logs/install.log ||
+    echo "Could not remove the device from Home Assistant (see logs/install.log); unregistering anyway." >&2
 exec ./bin/$exe --uninstall-manifest --log-file logs/install.log
 EOF
 chmod +x "$out/install.sh" "$out/uninstall.sh"
@@ -92,7 +97,8 @@ chmod +x "$out/install.sh" "$out/uninstall.sh"
     echo "Install / update:  ./install.sh     (SteamVR must be running)"
     echo "                   SteamVR remembers this folder's location: after moving it,"
     echo "                   run ./install.sh again."
-    echo "Uninstall:         ./uninstall.sh"
+    echo "Uninstall:         ./uninstall.sh   (also removes the device from Home Assistant;"
+    echo "                   needs the settings file and the MQTT broker)"
     echo "Logs:              logs/$exe.log (the app), logs/install.log (install.sh);"
     echo "                   run ./bin/$exe --help for options"
     echo