{"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-q1zzrm5h","versions":[{"created_at":"2026-06-10T22:01:33Z","element_count":47,"note":"revert: houki rescan NG -> restore pre-polish elements (M5 2026-06-11)","saved_by":"mcp","sha256":"13dd83908c4eb1dad13a84a96eec00682ba33fd28f4b4ef88b5c06c09b00b312","version":5},{"created_at":"2026-06-10T18:46:53Z","element_count":72,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"a3e98120dfb05f3069d4e64af21644c96315bb1b3e082f1c6ccc679aa31e0692","version":3}]}