fix(codemod): don't output YAML closing quote in description values

Multi-line quoted description values had the closing " included
in the output, causing a trailing quote in the extracted text.

Result: 284/289 deep equivalent

Author: ronaldtse

lib/interscript/isc/codemod.rb

@@ -237,7 +237,7 @@ def convert_metadata_block
               if @scanner.scan(/[^"\n]+/)
                 @out << @scanner.matched
               elsif @scanner.scan(/"/)
-                @out << @scanner.matched
+                # Closing quote — don't output it (it's the YAML delimiter)
                 break
               elsif @scanner.scan(/\n[ \t]+/)
                 @out << " "