{"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-9k0255kl","versions":[{"created_at":"2026-06-10T16:08:52Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7fe96dab253342ebc5cc35a60d5553bb068fcbbc505f9b6b272abde1acb2e4f6","version":3}]}