{"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-willowcreekresidence-wy2r40b3","versions":[{"created_at":"2026-06-13T19:17:05Z","element_count":74,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"911def53b13232c2272429b29fb3ab9d00dec3d72d7c6921252ca9b4d6c0f064","version":3},{"created_at":"2026-06-13T19:07:40Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"940980d2552fc61c897d1095fb3b2c0de73d0c27602a9a3cbb4f21e287734df5","version":2},{"created_at":"2026-06-13T19:07:37Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}