{"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-qak8kr9u","versions":[{"created_at":"2026-06-19T06:17:22Z","element_count":88,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2270669f6e4c0d1ad9448a2eb1d98877b0f270bf8ca9780ca69954bfe428d168","version":3},{"created_at":"2026-06-19T05:59:22Z","element_count":83,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"deffc13090c04a458f43bc9a35fb34250d907ae9a65f14abca271b7b6191a7e8","version":2},{"created_at":"2026-06-19T05:59:22Z","element_count":83,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}