docs(joinir): Phase 27.10 完了 - ドキュメント更新

- IMPLEMENTATION_LOG.md: Phase 27.10 + 27.10.1 完了記録
- joinir_coverage.md: 責務範囲(D-2)セクション追加

🎉 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
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nyash-codex
2025-11-23 22:51:45 +09:00
parent ff9ea58e59
commit 6ee4ee780a