v2.0.0-alpha.65 - Database Schema Fix

fix: Add missing role column to agents table in init schema

- Added role TEXT column to agents table in init/index.js
- Fixes 'table agents has no column named role' error when running hive-mind wizard
- Maintains backward compatibility with nullable column
- Users with existing databases can manually add column or reinitialize

Fixes #403

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Co-Authored-By: Claude <noreply@anthropic.com>