{"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-6ky5ppf6","versions":[{"created_at":"2026-06-10T22:52:39Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy80278800→quote22161645 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"8bb6d3481129e2cb3df586a8713c6e4dfed0f1f2c6a16c3ff9e205efb3ec49f4","version":15},{"created_at":"2026-06-10T14:46:15Z","element_count":71,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"76e84be3d57f9453e51f84319ecd8c221d444325fd02e256d72419a2f98e0e2c","version":6}]}