{"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-willowbrookhouse-xaonsml7","versions":[{"created_at":"2026-06-13T19:17:00Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5aa8dfbb1cb3430d5481d4f05baaea6cd44de8692cc0475d8bb0d6141c8954e9","version":3},{"created_at":"2026-06-13T19:01:47Z","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":"bebe36caf8d32c0367447a68c33a8935e43636e3d5ce06c0d9bff9cb5d1d42f2","version":2},{"created_at":"2026-06-13T19:01:43Z","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}]}