{"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-ardennesretreathouse-jdl3hzxe","versions":[{"created_at":"2026-06-10T22:53:48Z","element_count":85,"note":"legacy fix: jpy87379776→quote20693313 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"5631964a21e433cd3e4db3f216e2bfe8a36a7d4b61d92f08de02ccbf603db004","version":10},{"created_at":"2026-06-10T17:08:49Z","element_count":84,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b21c60a6a52fcb5e9da87a0f563146a5696cf777d8dab604f931f5b200c56a91","version":2}]}