{"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-theoldmillhouse-gk4jx1tw","versions":[{"created_at":"2026-06-13T19:03:15Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2bc5160e173d1041dd89fcfd1952cbb131827ea470fd1bcb085c5866a40610dc","version":3},{"created_at":"2026-06-13T18:51:53Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"002e835d15b0f2c8bb90d675101294f8b7ad2a53b3a28e604756ab0d06dc93fc","version":2},{"created_at":"2026-06-13T18:51:52Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}