???Courts applying equitable estoppel against a signatory have ???looked to the relationships of persons, wrongs and issues, in particular whether the claims that the nonsignatory sought to arbitrate were ??? ??? ???intimately founded in and intertwined with the underlying contract obligations.??? ??? ??? ??? ??? (Metalclad, 109 Cal.App.4th at p. 1713.) Application of ???the estoppel doctrine in t