fix xmrig bundling issues

setup.sh

@@ -627,8 +627,13 @@ XMRIG_SRC="$PROJECT_DIR/external/xmrig-hac"
 XMRIG_PREBUILT="$PROJECT_DIR/prebuilt-binaries/xmrig-hac"
 
 # Clean previous prebuilt xmrig binaries so we always rebuild
+# Only clean the binary for the platform(s) we are actually building,
+# otherwise a plain ./setup.sh deletes xmrig.exe without rebuilding it.
 if ! $CHECK_ONLY; then
-    rm -f "$XMRIG_PREBUILT/xmrig" "$XMRIG_PREBUILT/xmrig.exe" 2>/dev/null || true
+    rm -f "$XMRIG_PREBUILT/xmrig" 2>/dev/null || true
+    if $SETUP_WIN; then
+        rm -f "$XMRIG_PREBUILT/xmrig.exe" 2>/dev/null || true
+    fi
 fi
 
 # Helper: clone xmrig-hac if not present