{"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-6kxa9wh7","versions":[{"created_at":"2026-06-30T19:50:47Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"943ae754c6d18427b55944998632f01c24754eb64106bb663f25fd6ff6e84fe7","version":3},{"created_at":"2026-06-30T19:43:44Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"07d1bd7e44d9685af499b4d395198a13e83baec13ba2837a42d723426b28b537","version":2},{"created_at":"2026-06-30T19:43:44Z","element_count":130,"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}]}