{"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-oldmillhouse-5n2nqs1z","versions":[{"created_at":"2026-06-10T22:54:16Z","element_count":77,"note":"legacy fix: jpy72816480→quote19396944 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"1896e95ee851163fa4049d8e593b33bda8a8a2d8119ce31ca18ed23c00a7808d","version":10},{"created_at":"2026-06-10T17:08:49Z","element_count":85,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ee10a885f4a6a6401ffb629efc934792eba5d1674274c35a58b2084812353928","version":2}]}