{"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-p4mo4rmj","versions":[{"created_at":"2026-06-11T00:48:58Z","element_count":85,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1ad204ec61e4fa5e14429d88ea711a60452ff8dd7be0d8e313f5894d078ce12e","version":15},{"created_at":"2026-06-10T22:09:48Z","element_count":44,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"bba83cb39896f54606fab1e830158ce0531eefce0349f14d3caa3be76685e441","version":2}]}