{"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-q765u0u7","versions":[{"created_at":"2026-06-11T00:48:34Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cdc2abc8e292a0017674e41aaea69071f18118d7b9f9cbecbcedbd1cd82de582","version":15},{"created_at":"2026-06-10T22:02:33Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"91e9c1889b44ce7117080b248869bb1765e4ec51c11330ca0925d077a070727b","version":2}]}