{"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-m4k1t05c","versions":[{"created_at":"2026-06-11T01:05:16Z","element_count":91,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9b2b9f088e12e51482c920ef5adfafb346600f9e20d514b7144eceda4e43e531","version":13},{"created_at":"2026-06-10T22:26:47Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"95fb35dd06502b8942141fe36cc453f14006b549d65df8388051da91da3ad8b5","version":2}]}