{"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-iq3eiwsz","versions":[{"created_at":"2026-06-11T01:22:23Z","element_count":85,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d9257d855604f2621280c7429c1badead29edc70384c80f969c88b7402ccd6a2","version":12},{"created_at":"2026-06-10T22:48:30Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"80d5b076adf1f6f94c273031010bcc3e1d898a553842bbc02d1a915fd6780789","version":2}]}