{"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-f985acnb","versions":[{"created_at":"2026-06-13T18:20:46Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"1a3918fc14793caba668876b8270277f4e60aa6780d4f471cc1db6e03946bd5d","version":3},{"created_at":"2026-06-13T18:04:50Z","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":"52c3423ba7d503af46f80c6633ba61a1f7f467e1a774fd3c511c005ce434a966","version":2},{"created_at":"2026-06-13T18:04:45Z","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}]}