Update docs/private submodule: Phase 21.2-21.5 planning
Phase 21.2-21.5計画ドキュメント追加 - Phase 21.2: VM Adapter正規実装(完了) - Phase 21.3-21.5: Checker/Parser/Integration計画 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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