Add game rule keys (rule_mistborn_game_mode, narrative/sandbox setting names and descriptions) and utility keys (easy, medium). Add missing discover_metallic_arts_decision_confirm key. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add game rule keys (rule_mistborn_game_mode, narrative/sandbox setting names and descriptions) and utility keys (easy, medium). Add missing discover_metallic_arts_decision_confirm key. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>