{"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-w7phg74p","versions":[{"created_at":"2026-06-11T03:44:05Z","element_count":71,"note":"5軸GA polish 41->92 by M5 (autonomous)","saved_by":"mcp","sha256":"f7a2a25a874cfd6c781b266311e118f8bc80f7de5e2558bd2dbebce078d26324","version":3},{"created_at":"2026-06-11T03:31:41Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"049cce3d3c5d54737f7163a26ce91b673fab248fdc4809bd1cdbf56f8a0c9e84","version":2}]}