{"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-98wdt423","versions":[{"created_at":"2026-06-23T06:20:14Z","element_count":83,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"430c949eab7f25317d7e7e1e63004798549c3d73afae1593e426d8b56334d202","version":3},{"created_at":"2026-06-23T06:12:19Z","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":"2026-06-23T06:12:19Z","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}]}