{"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-xyena5r8","versions":[{"created_at":"2026-06-20T19:43:21Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a6c208a79adcc45b6d303c160a1e3dd0ebc6ae3a3871cf98b9a3279dd76d110a","version":3},{"created_at":"2026-06-20T19:28:10Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"97a15aa8f6c869e08827d4aa4be5bd4c7b38c3ba61b1870f37c60e8d8731e226","version":2},{"created_at":"2026-06-20T19:28:09Z","element_count":134,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}