- add deck_terms to schema imports
- add addTermsToDeck — diffs source term IDs against existing deck_terms,
inserts only new ones, returns count of inserted terms
- add updateValidatedLanguages — recalculates and persists validated_languages
on every run so coverage stays accurate as translation data grows
- wire both functions into main with isNewDeck guard to avoid redundant
validated_languages update on deck creation
- add final summary report
- fix possible undefined on result[0] in createDeck
- tick off remaining roadmap items
