TICKET-017: Character Persistence

[FirebrickRed]

Priority: FUTURE
Status: TODO
Description: Save/load character sheets
Acceptance Criteria:

• Database/file storage for characters
• Multiple character support per player
• Import/export functionality
• Character management UI

[FirebrickRed]

Character persistence has been fully implemented in CharacterPersistenceLoader.java. Features include: save/load to YAML files, multiple character support per player, character management methods (get/remove/store), and data validation. Characters persist to plugins/jkvttplugin/Characters/.yml