{"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-ihf47k3f","versions":[{"created_at":"2026-06-13T20:46:29Z","element_count":89,"note":"5軸GA polish 39->93 by M5 (autonomous)","saved_by":"mcp","sha256":"a218d31488b2a81dbf4f87887c04c085392e3be101720ca51e7d0d30037f86f6","version":3},{"created_at":"2026-06-13T20:27:15Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d861e38ffa05340d2386d48034694884e1808a99f6d7188aad6059eb335149a8","version":2},{"created_at":"2026-06-13T20:27:15Z","element_count":119,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}