{"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-c4p62505","versions":[{"created_at":"2026-06-10T22:59:08Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"8155dc23c10dedfe4d6488c6528fe4315df0139dec47dd1db6afd13435faafd6","version":9},{"created_at":"2026-06-10T20:22:39Z","element_count":68,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3716439ddc038bf82bae79119b2041f336473eb46cf02e1b89a6a1f81f33ab4c","version":2}]}