{"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-wdn4dwbc","versions":[{"created_at":"2026-06-10T22:54:00Z","element_count":77,"note":"legacy fix: jpy102533759→quote19805192 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"3a83c773dd64110ac6d53f4b9ee93b2dd5704f7ba64adf8e6a716106018a4015","version":10},{"created_at":"2026-06-10T17:23:16Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"33acee426093afec3264adecb0b71367f393a181898c5b0fa7ae53efaa3e0308","version":2}]}