Add cleanup script, version tracking, and changelog
New files: - automation/clean.sh: Clean up old logs, reports, backups (with --dry-run) - VERSION: Tracks configuration version (1.0.0) - CHANGELOG.md: Documents all changes in this refactor The cleanup script handles: - Old workflow logs (>30 days) - Old health reports (>30 days) - Excess backups (keeps last 10) Respects managed directories (projects/, stats-cache.json). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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