{"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-willowbrookhouse-5utawk69","versions":[{"created_at":"2026-06-13T18:06:11Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5aa8dfbb1cb3430d5481d4f05baaea6cd44de8692cc0475d8bb0d6141c8954e9","version":3},{"created_at":"2026-06-13T18:00:23Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"af3732b715ee6171e76621bf8d9c76c325dc4af532a3389de95bc2c430645e0e","version":2},{"created_at":"2026-06-13T18:00:22Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}