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em-proophboard-backup
Backup proophboard Event Modeling workspace to local JSON files. Downloads all chapters (with lanes, slices, elements) into .proophboard/chapters/ and records backup metadata. Use when: (1) user says 'backup', 'sync', 'download', 'snapshot' in context of proophboard or event model, (2) user wants to save the current board state to git, (3) user says 'em-proophboard-backup' or '/em-proophboard-backup'.
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