{"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-house-40yrw4tb","versions":[{"created_at":"2026-06-16T06:11:40Z","element_count":73,"note":"5軸GA polish 43->94 by M5 (autonomous)","saved_by":"mcp","sha256":"b123439c0e1ae3e80eece1ff5b9e666ceb63506ae1d1cab50497c2dd098f1b3c","version":3},{"created_at":"2026-06-16T06:05:28Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ff8594424cd313d3204230c018ad5b0db753ef80b936e2ee1e385630c411f82c","version":2},{"created_at":"2026-06-16T06:05:26Z","element_count":105,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}