{"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-i7z281xw","versions":[{"created_at":"2026-07-13T10:37:34Z","element_count":70,"note":"5軸GA polish 42->93 by M5 (autonomous)","saved_by":"mcp","sha256":"6447367c22025dbda3650a0b826815d14e7fee471a9f9364b7cee3986fb54170","version":3},{"created_at":"2026-07-13T10:32:01Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cefd176b3ab3ee1a6014a4a5c831d615f9d3239b7e491784059b82afd378524a","version":2},{"created_at":"2026-07-13T10:32:01Z","element_count":101,"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}]}