{"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-2f1knsch","versions":[{"created_at":"2026-06-11T03:31:05Z","element_count":84,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8154dffb935952d12d523477fc6aeeb837c3407c7c4b8fa3e882ae8a6e5cdb89","version":3},{"created_at":"2026-06-11T03:21:27Z","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":"ebdefc391ca0a7a66f0e46eca52c0aeb0efd4c070e0ff703a3869611dccb9a56","version":2}]}