{"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-hfuq50z2","versions":[{"created_at":"2026-06-11T01:56:45Z","element_count":74,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a63131f28edc49f65b16f0644d768aec121364327bf1a91a1ceaf73940200a37","version":7},{"created_at":"2026-06-10T23:59:42Z","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":"b55b9e35f0a83e18974962fdca6ffea90a5f6f944e22d883c65f6f2308e0b4ed","version":2}]}