{"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-gs8prx7u","versions":[{"created_at":"2026-06-11T01:38:47Z","element_count":89,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"69070659eafe550d9bb11576bcb658eb9f7441131133619f314c5f19c0e6abe4","version":9},{"created_at":"2026-06-10T23:32:29Z","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":"b0fa88f257aa571eb9ee997d2ed98df267702f10210e5e7670426f75e3c758c1","version":2}]}