{"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-2y8rs5dg","versions":[{"created_at":"2026-06-11T03:57:21Z","element_count":84,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"4e747c1b50534c70700916d840e11d4e37e6eacdc3a0354c5ec045f6d37a3b0d","version":3},{"created_at":"2026-06-11T03:43:28Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e2a423845186f6314e59bfdcc5bfb5f1e745a506a947b851def97a1815383384","version":2}]}