{"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-autri4r0","versions":[{"created_at":"2026-06-13T18:20:20Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2ab6e9f5035c51280ce648ef71e40d51c3a20f6161490f48e473bdea226f2f44","version":3},{"created_at":"2026-06-13T18:07:02Z","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":"19d82ed65d2cdd536a202c17cab474b753414adf65b369fc13c2a346aff4c64c","version":2},{"created_at":"2026-06-13T18:07:00Z","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}]}