{"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-o465mmf7","versions":[{"created_at":"2026-06-29T19:50:45Z","element_count":89,"note":"5軸GA polish 41->94 by M5 (autonomous)","saved_by":"mcp","sha256":"5377d474b5e3773ea4c56dfe95bbc3059da57a8f9d1705799b23d429f5b536d7","version":3},{"created_at":"2026-06-29T19:41:29Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3faabee7954e30f139b3f377ca897467b69a434fac1a61ba1ee883416050ec50","version":2},{"created_at":"2026-06-29T19:41:29Z","element_count":119,"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}]}