- Replace SQLite db module with file-based JSON storage in ~/.jigaido/
- Group bounties: ~/.jigaido/{group_id}/group.json
- User tracking: ~/.jigaido/{group_id}/user_{id}.json
- Personal bounties: ~/.jigaido/user_{id}/user.json
- Anyone can add bounties to groups; only creator can edit/delete
- Bounty IDs are sequential per group, not global
- Fix test mock compatibility issues in format_bounty function
- Add storage.py with load_user(), save_user(), next_bounty_id()
- Rewrite commands.py to use JSON storage (simplified)
- Remove db.py, schema.sql, cron.py, test_db.py
- Update SPEC.md to reflect new architecture
- Admin model removed (anyone can add, creator only can edit/delete)
- No reminders in v1
