{"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-o1tpa97k","versions":[{"created_at":"2026-06-11T01:57:05Z","element_count":84,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"59884616a80e1178d448c52c943e24d1917de31786a29dcc9387b6f112b35eff","version":6},{"created_at":"2026-06-11T00:17:46Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ffa2d83f5c12612f7c65b0abe26b51596fe74f4d73936618ab274ca8e42091f8","version":2}]}