{"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-28ied8wl","versions":[{"created_at":"2026-06-13T18:19:38Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a4caa23af603adceb22a4d9bf72c026d6312e696c7048412a5273ff3a6573fe5","version":3},{"created_at":"2026-06-13T18:02:54Z","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":"08e4da01a97a7c570cf7e6e8171a8a2c621d301008cc1d152288c4f741960d03","version":2},{"created_at":"2026-06-13T18:02:53Z","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}]}