{"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-wuu4dt3r","versions":[{"created_at":"2026-06-11T03:43:53Z","element_count":85,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"4d4bcc9f697510aef9d78844d58dca995ecdaff35946e58cc09530eba70ef396","version":3},{"created_at":"2026-06-11T03:39:01Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"45b052e25c0d13012fcc4c3c136a04f38ca915738cab48a43b43c8eb318aa271","version":2}]}