{"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-y1vv3voz","versions":[{"created_at":"2026-06-10T22:59:38Z","element_count":85,"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":"221d4aaf03428fe66289a09a80d3e30ed8af79b871e47d51d79989001f034c6e","version":9},{"created_at":"2026-06-10T20:38:17Z","element_count":73,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"736ba76dab984d587b2f70c7a5ba257103ffa80b76e13cb114b448b929035d3e","version":2}]}