{"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-house-2nv81a2i","versions":[{"created_at":"2026-06-10T22:57:52Z","element_count":65,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"bf35d19e3a18f862e503bef71955b898791948446f303e08c5b13540a8da810c","version":9},{"created_at":"2026-06-10T19:51:01Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6f702621dfcf03fcd11a6dc46766320f4d22360839a54be46f6c5e70906533c7","version":2}]}