{"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-n9wsxuh7","versions":[{"created_at":"2026-06-10T22:59:05Z","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":"1db93345967ace114f3b4c7c5ca9e75d54ed7ded7e52f06bfcaf32e23e4e70d5","version":9},{"created_at":"2026-06-10T20:22:38Z","element_count":90,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"820c4868a9e7a9e5f2fa1742c71b4a83866055bd699ea745f830ef3b6d2e3cf6","version":2}]}