{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-willowbrookbungalow-j222bpd8","versions":[{"created_at":"2026-08-15T21:54:08Z","element_count":101,"note":"loop3: 設計時延床 65.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3dab9981ec4d83c7b0c4f2524e959e743cc6089d66ff5658b45ccff47a8aa902","version":2},{"created_at":"2026-08-15T21:54:08Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}