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:

src/gamemax_gui.py

@@ -30,7 +30,7 @@ from PySide6.QtWidgets import (
 )
 from PySide6.QtNetwork import QLocalServer, QLocalSocket
 
-APP_VERSION = "1.2.1"
+APP_VERSION = "1.2.2"
 REPO = "oxpoe/Gamemax-linux-apps"
 RELEASES_API = f"https://api.github.com/repos/{REPO}/releases/latest"
 UPDATE_ASSET = "GAMEMAX-LCD-x86_64.AppImage"
@@ -685,6 +685,8 @@ class Window(QWidget):
 
     def log(self, text):
         self.logview.appendPlainText(text)
+        if os.environ.get("GAMEMAX_DEBUG"):
+            print(text, flush=True)
 
     def warn_once(self, text):
         if getattr(self, "_warned", None) != text:
@@ -896,8 +898,8 @@ def _main():
                  ("periksa pembaruan", w.do_check_update))
         for name, fn in steps:
             try:
-                fn()
-                print(f"[ OK ] {name}")
+                out = fn()
+                print(f"[ OK ] {name}" + (f" — {out}" if isinstance(out, str) and out else ""))
             except Exception as exc:  # noqa: BLE001
                 print(f"[GAGAL] {name}: {exc}")
         # jalur asinkron yang dipakai tombol: centang layar kosong + simpan