{"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-rk1ut7ra","versions":[{"created_at":"2026-06-10T22:57:59Z","element_count":65,"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":"3e7f4e4a240fb352cd09659d6b592f64cc71bfe5b675a0ade35a66a9852932ff","version":9},{"created_at":"2026-06-10T19:50:26Z","element_count":83,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ac4bb93c581313179c91b4c38a6e176fbd380fcaa8c6631c7be893dddfa2d6f1","version":2}]}