add cut bitmask option and debug dump support

Replace auto-cut toggle with --cut bit flags (default 011), wire flags through C/Ruby APIs, and document the new cut/debug-dump behavior in both READMEs.

Made-with: Cursor

ruby/lib/libptouch/binding.rb

@@ -25,7 +25,9 @@ module Libptouch
       layout :width_dots, :uint32,
              :height_dots, :uint32,
              :margin_mm, :uint8,
-             :_pad, [:uint8, 3]
+             :flags, :uint8,
+             :reserved0, :uint8,
+             :reserved1, :uint8
     end
 
     class MediaInfo < FFI::Struct
@@ -52,6 +54,7 @@ module Libptouch
     end
 
     attach_function :libptouch_create, [], :pointer
+    attach_function :libptouch_set_debug_dump_path, %i[pointer string], :void
     attach_function :libptouch_printer_family_label, [:uint32], :string
     attach_function :libptouch_destroy, [:pointer], :void
     attach_function :libptouch_strerror, [:pointer], :string