{"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-gentlehillbungalow-wq64swgz","versions":[{"created_at":"2026-06-13T17:38:59Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2cebdd09d8ae4623d557b8be3b87a7a4880e0e250c8854e49062eea063fbde94","version":3},{"created_at":"2026-06-13T17:27:47Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7c91743d26d85a2c93a3ab5d23b166cd10e6744824fa7f96d0817dd6769595b5","version":2},{"created_at":"2026-06-13T17:27:44Z","element_count":87,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}