{"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-r6f0oj8r","versions":[{"created_at":"2026-06-10T22:54:56Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote21000231 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"d53dba076ad6bbeb2ec26a07f7d5847a164d81d42254022f9b09173bab26dba2","version":10},{"created_at":"2026-06-10T17:56:39Z","element_count":83,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e0e07879ba86c34855381f95f5844020636d8e12b3ed38036048593f30381c54","version":3}]}