{"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-3gr9r53c","versions":[{"created_at":"2026-06-13T16:56:28Z","element_count":90,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"afd3795189520dbc96d1a86eb2d13f22247ab3b966852659954d5f8d62beeb7b","version":3},{"created_at":"2026-06-13T16:49:48Z","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":"336b1d736473ea733bb22930324ad751ebcaf6c2f5ef402ff25954bdb794a3a0","version":2},{"created_at":"2026-06-13T16:49:47Z","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}]}