{"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-5ciy2h9q","versions":[{"created_at":"2026-06-10T22:52:48Z","element_count":66,"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":"6d5272461f77132c0ba8b13c74b0cc18608ded06d128073709ed9ab486e6b24a","version":10},{"created_at":"2026-06-10T16:23:05Z","element_count":83,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"55763d198984978d2ec105d0c9110320d1c7736f647387acf3fdccaddfae2f74","version":2}]}