{"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-akwqkpqr","versions":[{"created_at":"2026-06-13T18:06:20Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9bccdd4dcee80ecf5dcde653206f1c1115c54d1dbb530ad33fa2b6400e650352","version":3},{"created_at":"2026-06-13T17:57:29Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"00ec83cc44945906cb0a739db72b6dc453e406789c117be76e1613d955086f83","version":2},{"created_at":"2026-06-13T17:57:27Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}