{"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-cp36at9w","versions":[{"created_at":"2026-06-11T01:05:12Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9bccdd4dcee80ecf5dcde653206f1c1115c54d1dbb530ad33fa2b6400e650352","version":13},{"created_at":"2026-06-10T22:25:35Z","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":"cdede7cad4cdeed0ab27f37ead57bb34c1dbf114ff3703a260ee42af9920b68e","version":2}]}