Fix GRUB autoinstall: escape semicolon, fix user-data

autoinstall/build-iso.sh

@@ -65,7 +65,8 @@ sed -i "s/set timeout=.*/set timeout=5/" "$GRUB_CFG"
 sed -i "s/set timeout_style=.*/set timeout_style=countdown/" "$GRUB_CFG"
 
 # Add autoinstall params to the first linux kernel line
-sed -i "/^\s*linux.*vmlinuz/s/$/ autoinstall quiet ds=nocloud;s=\/cdrom\/nocloud\//" "$GRUB_CFG"
+# Note: semicolon must be backslash-escaped in GRUB or it's treated as command separator
+sed -i "/^\s*linux.*vmlinuz/s/$/ autoinstall ds=nocloud\\;s=\/cdrom\/nocloud\//" "$GRUB_CFG"
 echo "✓ GRUB patched"
 
 # ── Extract MBR and EFI partition from original ISO ────

autoinstall/user-data

@@ -86,6 +86,3 @@ autoinstall:
   # ── Skip confirmations ────────────────────────
   user-data:
     disable_root: false
-
-  # Confirm destructive action without prompting
-  confirm-bugs: false