{"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-6kt5vtl1","versions":[{"created_at":"2026-06-10T22:59:00Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / jpy60335760→quote24058999 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"f291efbd8c25e7b6649d1978f10ce4deb5197bbb3101e86d32663ae55fb1665d","version":9},{"created_at":"2026-06-10T20:22:39Z","element_count":71,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"5217c6e29a538d24ea65f5be2e4d9e8442a5b3a28d008204bffb9cad1d462179","version":2}]}