{"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-6z91czqz","versions":[{"created_at":"2026-06-11T01:22:13Z","element_count":90,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"607f8867f4bc2c768b4945fc0b58b5892fea5778166f1acfd926d1f6dd091f3b","version":11},{"created_at":"2026-06-10T23:03:25Z","element_count":50,"note":"loop3: 設計時延床 60.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5a44520d3355bc0e2089adfc67bb09fa15e0dfaa44a4b4d6acf001c13c729991","version":2}]}