{"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-willowcreekbungalow-02aaa209","versions":[{"created_at":"2026-06-13T19:45:33Z","element_count":70,"note":"5軸GA polish 47->96 by M5 (autonomous)","saved_by":"mcp","sha256":"332cc9083940a2daea40855334410f1579942bc26e07c1d6f9a492d6ec5f478f","version":3},{"created_at":"2026-06-13T19:18:54Z","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":"08c72590288b6bb0f8f8abe6dcc62e6518f959e9ceb37f8e6903b24003d5f127","version":2},{"created_at":"2026-06-13T19:18:54Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}