feat: add claude-md-guardian, thinking commands, and security fixes
- Add claude-md-guardian agent with SessionStart hook for auto CLAUDE.md maintenance
- Add 6 thinking commands: /my-world, /emerge, /challenge, /connect, /today, /close
- Add my-world skill for one-shot vault context loading
- Fix command injection vulnerability in init-vault.sh (use env vars)
- Add error handling and logging to vault-sync.sh
- Update write-article skill with complete frontmatter fields
- Upgrade CLAUDE.md to v1.3.0 with cycle time tracking and exit criteria
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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