{"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-riverstonehouse-2nv8ftif","versions":[{"created_at":"2026-06-13T18:06:18Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5cb1e5d813f97546bf4cd242169c751758151f00627b224157c7ce3389d0463e","version":3},{"created_at":"2026-06-13T17:49:52Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"005562255a0c9925d6f83eddb9515ed183b5833dbdf6db30b03dc1d17b8c4fbf","version":2},{"created_at":"2026-06-13T17:49:51Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}