Cleanup comments

src/xmodem.cpp

@@ -123,11 +123,7 @@ void XModemAdapter::handlePacket(meshtastic_XModem xmodemPacket)
             filename[sizeof(filename) - 1] = '\0';
 
             if (xmodemPacket.control == meshtastic_XModem_Control_SOH) { // Receive this file and put to Flash
-                // Truncate the destination before opening. On Adafruit_LittleFS,
+                // FILE_O_WRITE on Adafruit_LittleFS is append, not truncate — remove first.
-                // `open(path, FILE_O_WRITE)` is *append* semantics (O_RDWR|O_CREAT +
-                // seek-to-EOF), so without a prior remove, our XModem-streamed
-                // payload would be concatenated onto whatever was there, producing
-                // a corrupt mixed file.
                 spiLock->lock();
                 if (FSCom.exists(filename))
                     FSCom.remove(filename);

src/xmodem.h

@@ -52,10 +52,7 @@ class XModemAdapter
     meshtastic_XModem getForPhone();
     void resetForPhone();
 
-    // True while a file is being received from or transmitted to the phone.
+    // True while a file transfer is in flight; lets callers avoid racing our `file` handle.
-    // Callers (e.g. NodeDB::saveNodeDatabaseToDisk) consult this to avoid
-    // opening the same on-disk file for write in parallel, which races our
-    // long-lived xmodem `file` handle and ends up producing a 0-byte file.
     bool isBusy() const { return isReceiving || isTransmitting; }
 
   private: