{"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-v3yrql6n","versions":[{"created_at":"2026-06-10T22:57:34Z","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":"297839c66da7a2147129920507c0ffe2517066026b75876160da9b290044943a","version":9},{"created_at":"2026-06-10T19:34:23Z","element_count":69,"note":"5軸GA polish 56->95 by M5 (autonomous)","saved_by":"mcp","sha256":"7e4773bb5209b6a17d86cdcd4faea77c8554b90068c958b3aa571d0b02a5df22","version":2}]}