'allowed': addButton at any (x,y) creates a cell on save
'restricted': addButton routes to a WordList if (x,y) is a WordList cell, else dropped with warning
'forbidden': addButton requires explicit (x,y) of an existing cell; otherwise CapabilityError
preservesAssetsOnSave
preservesAssetsOnSave:boolean
Whether the processor has a real saveModifiedTree that keeps original images/settings
If false, saveModifiedTree falls back to saveFromTree with a warning
wordList
wordList:"native"|"fallback"|"none"
WordList support level
'native': addWordListItem writes a real WordList structure on disk
'fallback': addWordListItem becomes addButton (still useful, just not dynamic)
Processor capabilities declaration