{"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-hawthornhouse-u3f7zt7b","versions":[{"created_at":"2026-07-08T06:05:46Z","element_count":53,"note":"5軸GA polish 38->87 by M5 (autonomous)","saved_by":"mcp","sha256":"5da0ff546170402b9dd90d3b3105f29c919077589eefb88bee7a29bde0b68758","version":3},{"created_at":"2026-07-08T05:58:19Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1db4e284f84726d619dc5255474ddfa3f3bb6805b87d4f0c78b28eb2be038019","version":2},{"created_at":"2026-07-08T05:58:19Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}