{"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-ic5xp1q9","versions":[{"created_at":"2026-06-10T22:58:18Z","element_count":77,"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":"0d353ebbaed4711c18b2f4d72adab476dc5c2dbd47c9498bfd3fc2a1cbeffb85","version":9},{"created_at":"2026-06-10T20:07:27Z","element_count":72,"note":"5軸GA polish 58->94 by M5 (autonomous)","saved_by":"mcp","sha256":"71c3f50628e9bd890f2cb3108921b77eba78575b64b8ea2f7b79b1100cfa02dc","version":2}]}