{"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-hz5wlw7m","versions":[{"created_at":"2026-06-13T21:01:27Z","element_count":91,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2aafe8df0733f5057be9eb600b1fcd33216d000d3dcb82109a89c11052abbd1d","version":3},{"created_at":"2026-06-13T20:43:31Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c8172e5858408579a79f18f3c55e6d7c20e9587a21faa01096e20cffdc746a15","version":2},{"created_at":"2026-06-13T20:43:31Z","element_count":101,"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}]}