feat: suite uji mencetak pesan hasil + GAMEMAX_DEBUG menyalin log ke stdout

docs: bagian Updates (pemeriksaan & pembaruan satu klik dari GitHub Releases)
versi 1.2.2

README.md

@@ -105,6 +105,7 @@ temperature source (Tctl vs Tccd).
 - **Plug and play**: the service waits for the device, streams while present and keeps
   waiting through unplug/replug; a udev rule grants access to the logged-in user
 - **Single instance**: launching the app again just raises the running window
+- **Self-update from GitHub Releases** (check + one-click update)
 - **Donate / GitHub buttons** in the app (window and tray menu)
 - **AppImage build** script (`packaging/build_appimage.sh`, PySide6 bundled)
 
@@ -208,6 +209,20 @@ docs/        reverse-engineering.md — full analysis (Indonesian)
 assets/      previews and icon
 ```
 
+## Updates
+
+The app keeps itself current from GitHub Releases:
+
+- On start (when running from an AppImage) and from the **Periksa pembaruan** button or the
+  tray menu, it asks the GitHub API for the latest release and compares it with its version.
+- When a newer release exists, a **Perbarui ke vX.Y.Z** button appears. One click downloads
+  the release asset, replaces the running AppImage atomically, refreshes the sender from the
+  new bundle and restarts the service. Restart the app to use the new version.
+- Nothing is downloaded without that click, and no other files are touched.
+
+If the check fails (offline, proxy), the message appears in the app log. `GAMEMAX_DEBUG=1`
+also mirrors the log to stdout for headless runs.
+
 ## Support
 
 If this project is useful to you: