{"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-xijg7q0f","versions":[{"created_at":"2026-06-13T17:52:38Z","element_count":74,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"911def53b13232c2272429b29fb3ab9d00dec3d72d7c6921252ca9b4d6c0f064","version":3},{"created_at":"2026-06-13T17:41:19Z","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":"345129dfa3de43d8c6713b8e5d54b4c6b6d3ed20cf19b59997244204d530166d","version":2},{"created_at":"2026-06-13T17:41:18Z","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}]}