Merge branch 'feature/flush-logs' into testing

Author: WillB97

runusb/__main__.py

@@ -253,6 +253,16 @@ def cleanup(self) -> None:
         except subprocess.TimeoutExpired:
             # The process did not exit after 5 seconds, so kill it.
             self._send_signal(signal.SIGKILL)
+
+        # Ensure logs have finished writing
+        self.log_thread.join()
+
+        # Explicitly close handler before removing it
+        self.handler.close()
+
+        # Sync filesystems before reporting status
+        os.sync()
+
         self._set_leds()
 
     def close(self) -> None: